2cos^2x+2cosx-2=0

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Solution for 2cos^2x+2cosx-2=0 equation:


Simplifying
2cos2x + 2cosx + -2 = 0

Reorder the terms:
-2 + 2cosx + 2cos2x = 0

Solving
-2 + 2cosx + 2cos2x = 0

Solving for variable 'c'.

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

Add '2' to each side of the equation.
-2 + 2cosx + 2 + 2cos2x = 0 + 2

Reorder the terms:
-2 + 2 + 2cosx + 2cos2x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2cosx + 2cos2x = 0 + 2
2cosx + 2cos2x = 0 + 2

Combine like terms: 0 + 2 = 2
2cosx + 2cos2x = 2

Reorder the terms:
-2 + 2cosx + 2cos2x = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + 2cosx + 2cos2x = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-1 + cosx + cos2x) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-1 + cosx + cos2x)' equal to zero and attempt to solve: Simplifying -1 + cosx + cos2x = 0 Solving -1 + cosx + cos2x = 0 Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + cosx + 1 + cos2x = 0 + 1 Reorder the terms: -1 + 1 + cosx + cos2x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + cosx + cos2x = 0 + 1 cosx + cos2x = 0 + 1 Combine like terms: 0 + 1 = 1 cosx + cos2x = 1 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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