4(cos^2)-1=0

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Solution for 4(cos^2)-1=0 equation: 


Simplifying
4(cos2) + -1 = 0

Reorder the terms:
-1 + 4cos2 = 0

Solving
-1 + 4cos2 = 0

Solving for variable 'c'.

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

Add '1' to each side of the equation.
-1 + 1 + 4cos2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 4cos2 = 0 + 1
4cos2 = 0 + 1

Combine like terms: 0 + 1 = 1
4cos2 = 1

Divide each side by '4os2'.
c = 0.25o-1s-2

Simplifying
c = 0.25o-1s-2

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