Cos(3x)=-2cosx

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Solution for Cos(3x)=-2cosx equation:


Simplifying
Cos(3x) = -2cosx

Remove parenthesis around (3x)
osC * 3x = -2cosx

Reorder the terms for easier multiplication:
3osC * x = -2cosx

Multiply osC * x
3osxC = -2cosx

Solving
3osxC = -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 + 3osxC = -2cosx + 2cosx

Combine like terms: -2cosx + 2cosx = 0
2cosx + 3osxC = 0

Factor out the Greatest Common Factor (GCF), 'osx'.
osx(2c + 3C) = 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 + 3C)' equal to zero and attempt to solve: Simplifying 2c + 3C = 0 Reorder the terms: 3C + 2c = 0 Solving 3C + 2c = 0 Move all terms containing o to the left, all other terms to the right. Add '-3C' to each side of the equation. 3C + -3C + 2c = 0 + -3C Combine like terms: 3C + -3C = 0 0 + 2c = 0 + -3C 2c = 0 + -3C Remove the zero: 2c = -3C Add '-2c' to each side of the equation. 2c + -2c = -3C + -2c Combine like terms: 2c + -2c = 0 0 = -3C + -2c Simplifying 0 = -3C + -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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