Y=4cos^2(x)-1

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Solution for Y=4cos^2(x)-1 equation: 


Simplifying
Y = 4cos2(x) + -1

Multiply cos2 * x
Y = 4cos2x + -1

Reorder the terms:
Y = -1 + 4cos2x

Solving
Y = -1 + 4cos2x

Solving for variable 'Y'.

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

Simplifying
Y = -1 + 4cos2x

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