cos^2x=5

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Solution for cos^2x=5 equation: 


Simplifying
cos2x = 5

Solving
cos2x = 5

Solving for variable 'c'.

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

Divide each side by 'os2x'.
c = 5o-1s-2x-1

Simplifying
c = 5o-1s-2x-1

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