Cos(5x)=-cos(2x)

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Solution for Cos(5x)=-cos(2x) equation:


Simplifying
Cos(5x) = -1cos(2x)

Remove parenthesis around (5x)
osC * 5x = -1cos(2x)

Reorder the terms for easier multiplication:
5osC * x = -1cos(2x)

Multiply osC * x
5osxC = -1cos(2x)

Remove parenthesis around (2x)
5osxC = -1cos * 2x

Reorder the terms for easier multiplication:
5osxC = -1 * 2cos * x

Multiply -1 * 2
5osxC = -2cos * x

Multiply cos * x
5osxC = -2cosx

Solving
5osxC = -2cosx

Solving for variable 'o'.

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

Add '2cosx' to each side of the equation.
2cosx + 5osxC = -2cosx + 2cosx

Combine like terms: -2cosx + 2cosx = 0
2cosx + 5osxC = 0

Factor out the Greatest Common Factor (GCF), 'osx'.
osx(2c + 5C) = 0

Subproblem 1

Set the factor 'osx' equal to zero and attempt to solve: Simplifying osx = 0 Solving osx = 0 Move all terms containing o to the left, all other terms to the right. Simplifying osx = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(2c + 5C)' equal to zero and attempt to solve: Simplifying 2c + 5C = 0 Reorder the terms: 5C + 2c = 0 Solving 5C + 2c = 0 Move all terms containing o to the left, all other terms to the right. Add '-5C' to each side of the equation. 5C + -5C + 2c = 0 + -5C Combine like terms: 5C + -5C = 0 0 + 2c = 0 + -5C 2c = 0 + -5C Remove the zero: 2c = -5C Add '-2c' to each side of the equation. 2c + -2c = -5C + -2c Combine like terms: 2c + -2c = 0 0 = -5C + -2c Simplifying 0 = -5C + -2c 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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