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Popular Trigonometry >

solvefor x,sin(ax+(1-a)y)<= 0

Solution

solve for

x, sin (a x + (1 - a) y) \leq 0

Solution

\frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a} \leq x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

Solution steps

sin (a x + (1 - a) y) \leq 0

For

sin (x) \leq a

, if

- 1 < a < 1

then

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

- π - arcsin (0) + 2 πn \leq (a x + (1 - a) y) \leq arcsin (0) + 2 πn

If

a \leq u \leq b

then

a \leq u and u \leq b

- π - arcsin (0) + 2 πn \leq a x + (1 - a) y and a x + (1 - a) y \leq arcsin (0) + 2 πn

- π - arcsin (0) + 2 πn \leq a x + (1 - a) y : x \geq \frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a}

- π - arcsin (0) + 2 πn \leq a x + (1 - a) y

Switch sides

a x + (1 - a) y \geq - π - arcsin (0) + 2 πn

Simplify

- π - arcsin (0) + 2 πn : 2 πn - π

- π - arcsin (0) + 2 πn

Use the following trivial identity:

arcsin (0) = 0

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= - π - 0 + 2 πn

- π - 0 + 2 πn = - π + 2 πn

= 2 πn - π

a x + (1 - a) y \geq 2 πn - π

Move

(1 - a) y

to the right side

a x + (1 - a) y \geq 2 πn - π

Subtract

(1 - a) y

from both sides

a x + (1 - a) y - (1 - a) y \geq 2 πn - π - (1 - a) y

Simplify

a x \geq 2 πn - π - (1 - a) y

a x \geq 2 πn - π - (1 - a) y

Divide both sides by

a

a x \geq 2 πn - π - (1 - a) y

Divide both sides by

a

\frac{a x}{a} \geq \frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a}

Simplify

x \geq \frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a}

x \geq \frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a}

a x + (1 - a) y \leq arcsin (0) + 2 πn : x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

a x + (1 - a) y \leq arcsin (0) + 2 πn

Simplify

arcsin (0) + 2 πn : 2 πn

arcsin (0) + 2 πn

Use the following trivial identity:

arcsin (0) = 0

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= 0 + 2 πn

0 + 2 πn = 2 πn

= 2 πn

a x + (1 - a) y \leq 2 πn

Move

(1 - a) y

to the right side

a x + (1 - a) y \leq 2 πn

Subtract

(1 - a) y

from both sides

a x + (1 - a) y - (1 - a) y \leq 2 πn - (1 - a) y

Simplify

a x \leq 2 πn - (1 - a) y

a x \leq 2 πn - (1 - a) y

Divide both sides by

a

a x \leq 2 πn - (1 - a) y

Divide both sides by

a

\frac{a x}{a} \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

Simplify

x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

Combine the intervals

x \geq \frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a} and x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

Merge Overlapping Intervals

\frac{2 πn}{a} - \frac{π}{a} - \frac{( 1 - a ) y}{a} \leq x \leq \frac{2 πn}{a} - \frac{( 1 - a ) y}{a}

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