5cos^2(2x)=4

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Solution for 5cos^2(2x)=4 equation: 


Simplifying
5cos2(2x) = 4

Remove parenthesis around (2x)
5cos2 * 2x = 4

Reorder the terms for easier multiplication:
5 * 2cos2 * x = 4

Multiply 5 * 2
10cos2 * x = 4

Multiply cos2 * x
10cos2x = 4

Solving
10cos2x = 4

Solving for variable 'c'.

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

Divide each side by '10os2x'.
c = 0.4o-1s-2x-1

Simplifying
c = 0.4o-1s-2x-1

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