cosx=-cosx

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Solution for cosx=-cosx equation: 


Simplifying
cosx = -1cosx

Solving
cosx = -1cosx

Solving for variable 'c'.

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

Add 'cosx' to each side of the equation.
cosx + cosx = -1cosx + cosx

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

Combine like terms: -1cosx + cosx = 0
2cosx = 0

Divide each side by '2'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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