2cosx+cosx=0

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Solution for 2cosx+cosx=0 equation: 


Simplifying
2cosx + cosx = 0

Combine like terms: 2cosx + cosx = 3cosx
3cosx = 0

Solving
3cosx = 0

Solving for variable 'c'.

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

Divide each side by '3'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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