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Popular Trigonometry >

50sin(-(2pi)/3 x-pi/2)>=-15

Solution

50 sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - 15

Solution

\frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n \leq x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

Interval Notation

[\frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n, \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n]

Decimal

- 2.39548 \dots + 3 n \leq x \leq - 0.60451 \dots + 3 n

Solution steps

50 sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - 15

Divide both sides by

50

50 sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - 15

Divide both sides by

50

\frac{50 sin ( - \frac{2 π}{3} x - \frac{π}{2} )}{50} \geq \frac{- 15}{50}

Simplify

\frac{50 sin ( - \frac{2 π}{3} x - \frac{π}{2} )}{50} \geq \frac{- 15}{50}

Simplify

\frac{50 sin ( - \frac{2 π}{3} x - \frac{π}{2} )}{50} : sin (- \frac{2 π}{3} x - \frac{π}{2})

\frac{50 sin ( - \frac{2 π}{3} x - \frac{π}{2} )}{50}

Divide the numbers:

\frac{50}{50} = 1

= sin (- \frac{2 π}{3} x - \frac{π}{2})

Simplify

\frac{- 15}{50} : - \frac{3}{10}

\frac{- 15}{50}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{15}{50}

Cancel the common factor:

5

= - \frac{3}{10}

sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - \frac{3}{10}

sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - \frac{3}{10}

sin (- \frac{2 π}{3} x - \frac{π}{2}) \geq - \frac{3}{10}

Factor out

- 1

from

- \frac{2 π}{3} x - \frac{π}{2} : - (\frac{2 π}{3} x + \frac{π}{2})

sin (- (\frac{2 π}{3} x + \frac{π}{2})) \geq - \frac{3}{10}

Use the following identity:

sin (- x) = - sin (x)

- sin (\frac{π}{2} + x \frac{2 π}{3}) \geq - \frac{3}{10}

Multiply both sides by

- 1

- sin (\frac{π}{2} + x \frac{2 π}{3}) \geq - \frac{3}{10}

Multiply both sides by -1 (reverse the inequality)

(- sin (\frac{π}{2} + x \frac{2 π}{3})) (- 1) \leq (- \frac{3}{10}) (- 1)

Simplify

sin (\frac{π}{2} + x \frac{2 π}{3}) \leq \frac{3}{10}

sin (\frac{π}{2} + x \frac{2 π}{3}) \leq \frac{3}{10}

For

sin (x) \leq a

, if

- 1 < a < 1

then

- π - arcsin (a) + 2 πn \leq x \leq arcsin (a) + 2 πn

- π - arcsin (\frac{3}{10}) + 2 πn \leq (\frac{π}{2} + x \frac{2 π}{3}) \leq arcsin (\frac{3}{10}) + 2 πn

a \leq u \leq b

then

a \leq u and u \leq b

- π - arcsin (\frac{3}{10}) + 2 πn \leq \frac{π}{2} + x \frac{2 π}{3} and \frac{π}{2} + x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn

- π - arcsin (\frac{3}{10}) + 2 πn \leq \frac{π}{2} + x \frac{2 π}{3} : x \geq \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

- π - arcsin (\frac{3}{10}) + 2 πn \leq \frac{π}{2} + x \frac{2 π}{3}

Switch sides

\frac{π}{2} + x \frac{2 π}{3} \geq - π - arcsin (\frac{3}{10}) + 2 πn

Move

\frac{π}{2}

to the right side

\frac{π}{2} + x \frac{2 π}{3} \geq - π - arcsin (\frac{3}{10}) + 2 πn

Subtract

\frac{π}{2}

from both sides

\frac{π}{2} + x \frac{2 π}{3} - \frac{π}{2} \geq - π - arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Simplify

x \frac{2 π}{3} \geq - π - arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

x \frac{2 π}{3} \geq - π - arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Multiply both sides by

3

x \frac{2 π}{3} \geq - π - arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Multiply both sides by

3

3 x \frac{2 π}{3} \geq - 3 π - 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Simplify

3 x \frac{2 π}{3} \geq - 3 π - 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Simplify

3 x \frac{2 π}{3} : 2 π x

3 x \frac{2 π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 \cdot 3 π}{3} x

Cancel the common factor:

3

= x \cdot 2 π

Simplify

- 3 π - 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2} : - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

- 3 π - 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Multiply the numbers:

3 \cdot 2 = 6

= - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - 3 \cdot \frac{π}{2}

Multiply

3 \cdot \frac{π}{2} : \frac{3 π}{2}

3 \cdot \frac{π}{2}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 3}{2}

= - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \geq - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \geq - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \geq - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

Divide both sides by

2 π

2 π x \geq - 3 π - 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

Divide both sides by

2 π

\frac{2 π x}{2 π} \geq - \frac{3 π}{2 π} - \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Simplify

\frac{2 π x}{2 π} \geq - \frac{3 π}{2 π} - \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Simplify

\frac{2 π x}{2 π} : x

\frac{2 π x}{2 π}

Divide the numbers:

\frac{2}{2} = 1

= \frac{π x}{π}

Cancel the common factor:

π

= x

Simplify

- \frac{3 π}{2 π} - \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π} : 3 n - \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

- \frac{3 π}{2 π} - \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Group like terms

= - \frac{3 π}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

\frac{3 π}{2 π} = \frac{3}{2}

\frac{3 π}{2 π}

Cancel the common factor:

π

= \frac{3}{2}

\frac{6 πn}{2 π} = 3 n

\frac{6 πn}{2 π}

Cancel

\frac{6 πn}{2 π} : 3 n

\frac{6 πn}{2 π}

Divide the numbers:

\frac{6}{2} = 3

= \frac{3 πn}{π}

Cancel the common factor:

π

= 3 n

= 3 n

\frac{\frac{3 π}{2}}{2 π} = \frac{3}{4}

\frac{\frac{3 π}{2}}{2 π}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{3 π}{2 \cdot 2 π}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{3 π}{4 π}

Cancel the common factor:

π

= \frac{3}{4}

= - \frac{3}{2} + 3 n - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

Group like terms

= 3 n - \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

x \geq 3 n - \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

x \geq 3 n - \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

Simplify

- \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π} : \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π}

- \frac{3}{2} - \frac{3}{4} - \frac{3 arcsin ( \frac{3}{10} )}{2 π}

Least Common Multiplier of

2, 4, 2 π : 4 π

2, 4, 2 π

Lowest Common Multiplier (LCM)

Least Common Multiplier of

2, 4, 2 : 4

2, 4, 2

Least Common Multiplier (LCM)

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Prime factorization of

4 : 2 \cdot 2

4

4

divides by

24 = 2 \cdot 2

= 2 \cdot 2

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Compute a number comprised of factors that appear in at least one of the following:

2, 4, 2

= 2 \cdot 2

Multiply the numbers:

2 \cdot 2 = 4

= 4

Compute an expression comprised of factors that appear in at least one of the factored expressions

= 4 π

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

4 π

For

\frac{3}{2} :

multiply the denominator and numerator by

2 π

\frac{3}{2} = \frac{3 \cdot 2 π}{2 \cdot 2 π} = \frac{6 π}{4 π}

For

\frac{3}{4} :

multiply the denominator and numerator by

π

\frac{3}{4} = \frac{3 π}{4 π}

For

\frac{3 arcsin ( \frac{3}{10} )}{2 π} :

multiply the denominator and numerator by

2

\frac{3 arcsin ( \frac{3}{10} )}{2 π} = \frac{3 arcsin ( \frac{3}{10} ) \cdot 2}{2 π 2} = \frac{6 arcsin ( \frac{3}{10} )}{4 π}

= - \frac{6 π}{4 π} - \frac{3 π}{4 π} - \frac{6 arcsin ( \frac{3}{10} )}{4 π}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 6 π - 3 π - 6 arcsin ( \frac{3}{10} )}{4 π}

Add similar elements:

- 6 π - 3 π = - 9 π

= \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π}

x \geq \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

x \geq \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

\frac{π}{2} + x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn : x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

\frac{π}{2} + x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn

Move

\frac{π}{2}

to the right side

\frac{π}{2} + x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn

Subtract

\frac{π}{2}

from both sides

\frac{π}{2} + x \frac{2 π}{3} - \frac{π}{2} \leq arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Simplify

x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Multiply both sides by

3

x \frac{2 π}{3} \leq arcsin (\frac{3}{10}) + 2 πn - \frac{π}{2}

Multiply both sides by

3

3 x \frac{2 π}{3} \leq 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Simplify

3 x \frac{2 π}{3} \leq 3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Simplify

3 x \frac{2 π}{3} : 2 π x

3 x \frac{2 π}{3}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 \cdot 3 π}{3} x

Cancel the common factor:

3

= x \cdot 2 π

Simplify

3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2} : 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

3 arcsin (\frac{3}{10}) + 3 \cdot 2 πn - 3 \cdot \frac{π}{2}

Multiply the numbers:

3 \cdot 2 = 6

= 3 arcsin (\frac{3}{10}) + 6 πn - 3 \cdot \frac{π}{2}

Multiply

3 \cdot \frac{π}{2} : \frac{3 π}{2}

3 \cdot \frac{π}{2}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 3}{2}

= 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \leq 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \leq 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

2 π x \leq 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

Divide both sides by

2 π

2 π x \leq 3 arcsin (\frac{3}{10}) + 6 πn - \frac{3 π}{2}

Divide both sides by

2 π

\frac{2 π x}{2 π} \leq \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Simplify

\frac{2 π x}{2 π} \leq \frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Simplify

\frac{2 π x}{2 π} : x

\frac{2 π x}{2 π}

Divide the numbers:

\frac{2}{2} = 1

= \frac{π x}{π}

Cancel the common factor:

π

= x

Simplify

\frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π} : 3 n - \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

\frac{3 arcsin ( \frac{3}{10} )}{2 π} + \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π}

Group like terms

= \frac{6 πn}{2 π} - \frac{\frac{3 π}{2}}{2 π} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

\frac{6 πn}{2 π} = 3 n

\frac{6 πn}{2 π}

Cancel

\frac{6 πn}{2 π} : 3 n

\frac{6 πn}{2 π}

Divide the numbers:

\frac{6}{2} = 3

= \frac{3 πn}{π}

Cancel the common factor:

π

= 3 n

= 3 n

\frac{\frac{3 π}{2}}{2 π} = \frac{3}{4}

\frac{\frac{3 π}{2}}{2 π}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{3 π}{2 \cdot 2 π}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{3 π}{4 π}

Cancel the common factor:

π

= \frac{3}{4}

= 3 n - \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

x \leq 3 n - \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

x \leq 3 n - \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

Simplify

- \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π} : \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π}

- \frac{3}{4} + \frac{3 arcsin ( \frac{3}{10} )}{2 π}

Least Common Multiplier of

4, 2 π : 4 π

4, 2 π

Lowest Common Multiplier (LCM)

Least Common Multiplier of

4, 2 : 4

4, 2

Least Common Multiplier (LCM)

Prime factorization of

4 : 2 \cdot 2

4

4

divides by

24 = 2 \cdot 2

= 2 \cdot 2

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Multiply each factor the greatest number of times it occurs in either

4

2

= 2 \cdot 2

Multiply the numbers:

2 \cdot 2 = 4

= 4

Compute an expression comprised of factors that appear either in

4

2 π

= 4 π

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

4 π

For

\frac{3}{4} :

multiply the denominator and numerator by

π

\frac{3}{4} = \frac{3 π}{4 π}

For

\frac{3 arcsin ( \frac{3}{10} )}{2 π} :

multiply the denominator and numerator by

2

\frac{3 arcsin ( \frac{3}{10} )}{2 π} = \frac{3 arcsin ( \frac{3}{10} ) \cdot 2}{2 π 2} = \frac{6 arcsin ( \frac{3}{10} )}{4 π}

= - \frac{3 π}{4 π} + \frac{6 arcsin ( \frac{3}{10} )}{4 π}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π}

x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

Combine the intervals

x \geq \frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n and x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

Merge Overlapping Intervals

\frac{- 9 π - 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n \leq x \leq \frac{- 3 π + 6 arcsin ( \frac{3}{10} )}{4 π} + 3 n

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