cosx=-2seny

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Solution for cosx=-2seny equation: 


Simplifying
cosx = -2seny

Solving
cosx = -2ensy

Solving for variable 'c'.

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

Divide each side by 'osx'.
c = -2eno-1x-1y

Simplifying
c = -2eno-1x-1y

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