cos(2x)=-4

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Solution for cos(2x)=-4 equation: 


Simplifying
cos(2x) = -4

Remove parenthesis around (2x)
cos * 2x = -4

Reorder the terms for easier multiplication:
2cos * x = -4

Multiply cos * x
2cosx = -4

Solving
2cosx = -4

Solving for variable 'c'.

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

Divide each side by '2osx'.
c = -2o-1s-1x-1

Simplifying
c = -2o-1s-1x-1

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