-cos(x)-2cos(2x)=0

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Solution for -cos(x)-2cos(2x)=0 equation:


Simplifying
-1cos(x) + -2cos(2x) = 0

Multiply cos * x
-1cosx + -2cos(2x) = 0

Remove parenthesis around (2x)
-1cosx + -2cos * 2x = 0

Reorder the terms for easier multiplication:
-1cosx + -2 * 2cos * x = 0

Multiply -2 * 2
-1cosx + -4cos * x = 0

Multiply cos * x
-1cosx + -4cosx = 0

Combine like terms: -1cosx + -4cosx = -5cosx
-5cosx = 0

Solving
-5cosx = 0

Solving for variable 'c'.

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

Divide each side by '-5'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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