cos^2(4x)-cos(4x)-2=0

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


Simplifying
cos2(4x) + -1cos(4x) + -2 = 0

Remove parenthesis around (4x)
cos2 * 4x + -1cos(4x) + -2 = 0

Reorder the terms for easier multiplication:
4cos2 * x + -1cos(4x) + -2 = 0

Multiply cos2 * x
4cos2x + -1cos(4x) + -2 = 0

Remove parenthesis around (4x)
4cos2x + -1cos * 4x + -2 = 0

Reorder the terms for easier multiplication:
4cos2x + -1 * 4cos * x + -2 = 0

Multiply -1 * 4
4cos2x + -4cos * x + -2 = 0

Multiply cos * x
4cos2x + -4cosx + -2 = 0

Reorder the terms:
-2 + -4cosx + 4cos2x = 0

Solving
-2 + -4cosx + 4cos2x = 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 + -4cosx + 2 + 4cos2x = 0 + 2

Reorder the terms:
-2 + 2 + -4cosx + 4cos2x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -4cosx + 4cos2x = 0 + 2
-4cosx + 4cos2x = 0 + 2

Combine like terms: 0 + 2 = 2
-4cosx + 4cos2x = 2

Reorder the terms:
-2 + -4cosx + 4cos2x = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -4cosx + 4cos2x = 0

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

Ignore the factor 2.

Subproblem 1

Set the factor '(-1 + -2cosx + 2cos2x)' equal to zero and attempt to solve: Simplifying -1 + -2cosx + 2cos2x = 0 Solving -1 + -2cosx + 2cos2x = 0 Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + -2cosx + 1 + 2cos2x = 0 + 1 Reorder the terms: -1 + 1 + -2cosx + 2cos2x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -2cosx + 2cos2x = 0 + 1 -2cosx + 2cos2x = 0 + 1 Combine like terms: 0 + 1 = 1 -2cosx + 2cos2x = 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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