2cos^2(20)-1=0

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Solution for 2cos^2(20)-1=0 equation:


Simplifying
2cos2(20) + -1 = 0

Reorder the terms for easier multiplication:
2 * 20cos2 + -1 = 0

Multiply 2 * 20
40cos2 + -1 = 0

Reorder the terms:
-1 + 40cos2 = 0

Solving
-1 + 40cos2 = 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 + 40cos2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 40cos2 = 0 + 1
40cos2 = 0 + 1

Combine like terms: 0 + 1 = 1
40cos2 = 1

Divide each side by '40os2'.
c = 0.025o-1s-2

Simplifying
c = 0.025o-1s-2

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