Cos(2x)+cosx=0

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Solution for Cos(2x)+cosx=0 equation:


Simplifying
Cos(2x) + cosx = 0

Remove parenthesis around (2x)
osC * 2x + cosx = 0

Reorder the terms for easier multiplication:
2osC * x + cosx = 0

Multiply osC * x
2osxC + cosx = 0

Reorder the terms:
cosx + 2osxC = 0

Solving
cosx + 2osxC = 0

Solving for variable 'c'.

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

Add '-2osxC' to each side of the equation.
cosx + 2osxC + -2osxC = 0 + -2osxC

Combine like terms: 2osxC + -2osxC = 0
cosx + 0 = 0 + -2osxC
cosx = 0 + -2osxC
Remove the zero:
cosx = -2osxC

Divide each side by 'osx'.
c = -2C

Simplifying
c = -2C

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