cos(x)+cos(2x)=-1

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Solution for cos(x)+cos(2x)=-1 equation: 


Simplifying
cos(x) + cos(2x) = -1

Multiply cos * x
cosx + cos(2x) = -1

Remove parenthesis around (2x)
cosx + cos * 2x = -1

Reorder the terms for easier multiplication:
cosx + 2cos * x = -1

Multiply cos * x
cosx + 2cosx = -1

Combine like terms: cosx + 2cosx = 3cosx
3cosx = -1

Solving
3cosx = -1

Solving for variable 'c'.

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

Divide each side by '3osx'.
c = -0.3333333333o-1s-1x-1

Simplifying
c = -0.3333333333o-1s-1x-1

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