cos(y)=-sin(2y)

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Solution for cos(y)=-sin(2y) equation: 


Simplifying
cos(y) = -1sin(2y)

Multiply cos * y
cosy = -1sin(2y)

Remove parenthesis around (2y)
cosy = -1ins * 2y

Reorder the terms for easier multiplication:
cosy = -1 * 2ins * y

Multiply -1 * 2
cosy = -2ins * y

Multiply ins * y
cosy = -2insy

Solving
cosy = -2insy

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Divide each side by 'osy'.
c = -2ino-1

Simplifying
c = -2ino-1

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