What is the general solution for 250sin(75)=393.19sin(45-θ) ?

The general solution for 250sin(75)=393.19sin(45-θ) is θ=-360n+45-0.66132…,θ=-180-360n+45+0.66132…

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250sin(75)=393.19sin(45-θ)

Solution

250 sin (7 5^{\circ}) = 393.19 sin (4 5^{\circ} - θ)

Solution

θ = - 36 0^{\circ} n + 4 5^{\circ} - 0.66132 \dots, θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + 0.66132 \dots

Radians

θ = \frac{π}{4} - 0.66132 \dots - 2 πn, θ = - π + \frac{π}{4} + 0.66132 \dots - 2 πn

Solution steps

250 sin (7 5^{\circ}) = 393.19 sin (4 5^{\circ} - θ)

sin (7 5^{\circ}) = \frac{6 + 2}{4}

sin (7 5^{\circ})

Rewrite using trig identities:

sin (4 5^{\circ}) cos (3 0^{\circ}) + cos (4 5^{\circ}) sin (3 0^{\circ})

sin (7 5^{\circ})

Write

sin (7 5^{\circ})

sin (4 5^{\circ} + 3 0^{\circ})

= sin (4 5^{\circ} + 3 0^{\circ})

Use the Angle Sum identity:

sin (s + t) = sin (s) cos (t) + cos (s) sin (t)

= sin (4 5^{\circ}) cos (3 0^{\circ}) + cos (4 5^{\circ}) sin (3 0^{\circ})

= sin (4 5^{\circ}) cos (3 0^{\circ}) + cos (4 5^{\circ}) sin (3 0^{\circ})

Use the following trivial identity:

sin (4 5^{\circ}) = \frac{2}{2}

sin (4 5^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{2}{2}

Use the following trivial identity:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

Use the following trivial identity:

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{2}{2}

Use the following trivial identity:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= \frac{2}{2} \cdot \frac{3}{2} + \frac{2}{2} \cdot \frac{1}{2}

Simplify

\frac{2}{2} \cdot \frac{3}{2} + \frac{2}{2} \cdot \frac{1}{2} : \frac{6 + 2}{4}

\frac{2}{2} \cdot \frac{3}{2} + \frac{2}{2} \cdot \frac{1}{2}

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

\frac{2}{2} \cdot \frac{3}{2}

Multiply fractions:

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

= \frac{2 3}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{2 3}{4}

Simplify

23 : 6

23

Apply radical rule:

a b = a \cdot b

23 = 2 \cdot 3

= 2 \cdot 3

Multiply the numbers:

2 \cdot 3 = 6

= 6

= \frac{6}{4}

\frac{2}{2} \cdot \frac{1}{2} = \frac{2}{4}

\frac{2}{2} \cdot \frac{1}{2}

Multiply fractions:

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

= \frac{2 \cdot 1}{2 \cdot 2}

Multiply:

2 \cdot 1 = 2

= \frac{2}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{2}{4}

= \frac{6}{4} + \frac{2}{4}

Apply rule

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

= \frac{6 + 2}{4}

= \frac{6 + 2}{4}

250 \cdot \frac{6 + 2}{4} = 393.19 sin (4 5^{\circ} - θ)

Switch sides

393.19 sin (4 5^{\circ} - θ) = 250 \cdot \frac{6 + 2}{4}

Multiply both sides by

100

393.19 sin (4 5^{\circ} - θ) = 250 \cdot \frac{6 + 2}{4}

To eliminate decimal points, multiply by 10 for every digit after the decimal pointThere are

2

digits to the right of the decimal point, therefore multiply by

100

393.19 sin (4 5^{\circ} - θ) \cdot 100 = 250 \cdot \frac{6 + 2}{4} \cdot 100

Refine

39319 sin (4 5^{\circ} - θ) = 6250 (6 + 2)

39319 sin (4 5^{\circ} - θ) = 6250 (6 + 2)

Divide both sides by

39319

39319 sin (4 5^{\circ} - θ) = 6250 (6 + 2)

Divide both sides by

39319

\frac{39319 sin ( 4 5 ^{\circ} - θ )}{39319} = \frac{6250 ( 6 + 2 )}{39319}

Simplify

sin (4 5^{\circ} - θ) = \frac{6250 ( 6 + 2 )}{39319}

sin (4 5^{\circ} - θ) = \frac{6250 ( 6 + 2 )}{39319}

Apply trig inverse properties

sin (4 5^{\circ} - θ) = \frac{6250 ( 6 + 2 )}{39319}

General solutions for

sin (4 5^{\circ} - θ) = \frac{6250 ( 6 + 2 )}{39319}

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

4 5^{\circ} - θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n, 4 5^{\circ} - θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

4 5^{\circ} - θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n, 4 5^{\circ} - θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

Solve

4 5^{\circ} - θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n : θ = - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

4 5^{\circ} - θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

Move

4 5^{\circ}

to the right side

4 5^{\circ} - θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

Subtract

4 5^{\circ}

from both sides

4 5^{\circ} - θ - 4 5^{\circ} = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

- θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

- θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Divide both sides by

- 1

- θ = arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Divide both sides by

- 1

\frac{- θ}{- 1} = \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Simplify

\frac{- θ}{- 1} = \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Simplify

\frac{- θ}{- 1} : θ

\frac{- θ}{- 1}

Apply the fraction rule:

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

= \frac{θ}{1}

Apply rule

\frac{a}{1} = a

= θ

Simplify

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1} : - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Group like terms

= \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1} + \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

\frac{36 0 ^{\circ} n}{- 1} = - 36 0^{\circ} n

\frac{36 0 ^{\circ} n}{- 1}

Apply the fraction rule:

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

= - \frac{36 0 ^{\circ} n}{1}

Apply rule

\frac{a}{1} = a

= - 36 0^{\circ} n

= - 36 0^{\circ} n - \frac{4 5 ^{\circ}}{- 1} + \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

\frac{4 5 ^{\circ}}{- 1} = - 4 5^{\circ}

\frac{4 5 ^{\circ}}{- 1}

Apply the fraction rule:

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

= - \frac{4 5 ^{\circ}}{1}

Apply the fraction rule:

\frac{a}{1} = a

\frac{4 5 ^{\circ}}{1} = 4 5^{\circ}

= - 4 5^{\circ}

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} = - arcsin (\frac{6250 ( 6 + 2 )}{39319})

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

Apply the fraction rule:

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

= - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{1}

Apply the fraction rule:

\frac{a}{1} = a

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{1} = arcsin (\frac{6250 ( 6 + 2 )}{39319})

= - arcsin (\frac{6250 ( 6 + 2 )}{39319})

= - 36 0^{\circ} n - (- 4 5^{\circ}) - arcsin (\frac{6250 ( 6 + 2 )}{39319})

Apply rule

- (- a) = a

= - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319})

Solve

4 5^{\circ} - θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n : θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

4 5^{\circ} - θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

Move

4 5^{\circ}

to the right side

4 5^{\circ} - θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n

Subtract

4 5^{\circ}

from both sides

4 5^{\circ} - θ - 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

- θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

- θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Divide both sides by

- 1

- θ = 18 0^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}) + 36 0^{\circ} n - 4 5^{\circ}

Divide both sides by

- 1

\frac{- θ}{- 1} = \frac{18 0 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Simplify

\frac{- θ}{- 1} = \frac{18 0 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Simplify

\frac{- θ}{- 1} : θ

\frac{- θ}{- 1}

Apply the fraction rule:

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

= \frac{θ}{1}

Apply rule

\frac{a}{1} = a

= θ

Simplify

\frac{18 0 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1} : - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

\frac{18 0 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1}

Group like terms

= \frac{18 0 ^{\circ}}{- 1} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

\frac{18 0 ^{\circ}}{- 1} = - 18 0^{\circ}

\frac{18 0 ^{\circ}}{- 1}

Apply the fraction rule:

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

= - 18 0^{\circ}

Apply rule

\frac{a}{1} = a

= - 18 0^{\circ}

= - 18 0^{\circ} + \frac{36 0 ^{\circ} n}{- 1} - \frac{4 5 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

\frac{36 0 ^{\circ} n}{- 1} = - 36 0^{\circ} n

\frac{36 0 ^{\circ} n}{- 1}

Apply the fraction rule:

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

= - \frac{36 0 ^{\circ} n}{1}

Apply rule

\frac{a}{1} = a

= - 36 0^{\circ} n

= - 18 0^{\circ} - 36 0^{\circ} n - \frac{4 5 ^{\circ}}{- 1} - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

\frac{4 5 ^{\circ}}{- 1} = - 4 5^{\circ}

\frac{4 5 ^{\circ}}{- 1}

Apply the fraction rule:

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

= - \frac{4 5 ^{\circ}}{1}

Apply the fraction rule:

\frac{a}{1} = a

\frac{4 5 ^{\circ}}{1} = 4 5^{\circ}

= - 4 5^{\circ}

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1} = - arcsin (\frac{6250 ( 6 + 2 )}{39319})

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{- 1}

Apply the fraction rule:

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

= - \frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{1}

Apply the fraction rule:

\frac{a}{1} = a

\frac{arcsin ( \frac{6250 ( 6 + 2 )}{39319} )}{1} = arcsin (\frac{6250 ( 6 + 2 )}{39319})

= - arcsin (\frac{6250 ( 6 + 2 )}{39319})

= - 18 0^{\circ} - 36 0^{\circ} n - (- 4 5^{\circ}) - (- arcsin (\frac{6250 ( 6 + 2 )}{39319}))

Apply rule

- (- a) = a

= - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

θ = - 36 0^{\circ} n + 4 5^{\circ} - arcsin (\frac{6250 ( 6 + 2 )}{39319}), θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + arcsin (\frac{6250 ( 6 + 2 )}{39319})

Show solutions in decimal form

θ = - 36 0^{\circ} n + 4 5^{\circ} - 0.66132 \dots, θ = - 18 0^{\circ} - 36 0^{\circ} n + 4 5^{\circ} + 0.66132 \dots

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Frequently Asked Questions (FAQ)

What is the general solution for 250sin(75)=393.19sin(45-θ) ?
The general solution for 250sin(75)=393.19sin(45-θ) is θ=-360n+45-0.66132…,θ=-180-360n+45+0.66132…