9cos(2x)=4

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Solution for 9cos(2x)=4 equation: 


Simplifying
9cos(2x) = 4

Remove parenthesis around (2x)
9cos * 2x = 4

Reorder the terms for easier multiplication:
9 * 2cos * x = 4

Multiply 9 * 2
18cos * x = 4

Multiply cos * x
18cosx = 4

Solving
18cosx = 4

Solving for variable 'c'.

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

Divide each side by '18osx'.
c = 0.2222222222o-1s-1x-1

Simplifying
c = 0.2222222222o-1s-1x-1

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