cosx=4cos^3x-3cosx

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Solution for cosx=4cos^3x-3cosx equation:


Simplifying
cosx = 4cos3x + -3cosx

Reorder the terms:
cosx = -3cosx + 4cos3x

Solving
cosx = -3cosx + 4cos3x

Solving for variable 'c'.

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

Add '3cosx' to each side of the equation.
cosx + 3cosx = -3cosx + 3cosx + 4cos3x

Combine like terms: cosx + 3cosx = 4cosx
4cosx = -3cosx + 3cosx + 4cos3x

Combine like terms: -3cosx + 3cosx = 0
4cosx = 0 + 4cos3x
4cosx = 4cos3x

Add '-4cos3x' to each side of the equation.
4cosx + -4cos3x = 4cos3x + -4cos3x

Combine like terms: 4cos3x + -4cos3x = 0
4cosx + -4cos3x = 0

Factor out the Greatest Common Factor (GCF), '4cosx'.
4cosx(1 + -1s2) = 0

Factor a difference between two squares.
4cosx((1 + s)(1 + -1s)) = 0

Ignore the factor 4.

Subproblem 1

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

Subproblem 3

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