2cos^2(67.5)-1=0

Solution for 2cos^2(67.5)-1=0 equation:

Simplifying
2cos2(67.5) + -1 = 0

Reorder the terms for easier multiplication:
2 * 67.5cos2 + -1 = 0

Multiply 2 * 67.5
135cos2 + -1 = 0

Reorder the terms:
-1 + 135cos2 = 0

Solving
-1 + 135cos2 = 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 + 135cos2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 135cos2 = 0 + 1
135cos2 = 0 + 1

Combine like terms: 0 + 1 = 1
135cos2 = 1

Divide each side by '135os2'.
c = 0.007407407407o-1s-2

Simplifying
c = 0.007407407407o-1s-2