2cos(x)+cos(2x)=15

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Solution for 2cos(x)+cos(2x)=15 equation: 


Simplifying
2cos(x) + cos(2x) = 15

Multiply cos * x
2cosx + cos(2x) = 15

Remove parenthesis around (2x)
2cosx + cos * 2x = 15

Reorder the terms for easier multiplication:
2cosx + 2cos * x = 15

Multiply cos * x
2cosx + 2cosx = 15

Combine like terms: 2cosx + 2cosx = 4cosx
4cosx = 15

Solving
4cosx = 15

Solving for variable 'c'.

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

Divide each side by '4osx'.
c = 3.75o-1s-1x-1

Simplifying
c = 3.75o-1s-1x-1

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