sin(3x)=sin(x)*(4*cos^2(x)-1)

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Solution for sin(3x)=sin(x)*(4*cos^2(x)-1) equation:


Simplifying
sin(3x) = sin(x)(4cos2(x) + -1)

Remove parenthesis around (3x)
ins * 3x = sin(x)(4cos2(x) + -1)

Reorder the terms for easier multiplication:
3ins * x = sin(x)(4cos2(x) + -1)

Multiply ins * x
3insx = sin(x)(4cos2(x) + -1)

Multiply cos2 * x
3insx = ins * x(4cos2x + -1)

Reorder the terms:
3insx = ins * x(-1 + 4cos2x)

Multiply ins * x
3insx = insx(-1 + 4cos2x)
3insx = (-1 * insx + 4cos2x * insx)

Reorder the terms:
3insx = (4cinos3x2 + -1insx)
3insx = (4cinos3x2 + -1insx)

Solving
3insx = 4cinos3x2 + -1insx

Solving for variable 'i'.

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

Add '-4cinos3x2' to each side of the equation.
-4cinos3x2 + 3insx = 4cinos3x2 + -4cinos3x2 + -1insx

Combine like terms: 4cinos3x2 + -4cinos3x2 = 0
-4cinos3x2 + 3insx = 0 + -1insx
-4cinos3x2 + 3insx = -1insx

Add 'insx' to each side of the equation.
-4cinos3x2 + 3insx + insx = -1insx + insx

Combine like terms: 3insx + insx = 4insx
-4cinos3x2 + 4insx = -1insx + insx

Combine like terms: -1insx + insx = 0
-4cinos3x2 + 4insx = 0

Factor out the Greatest Common Factor (GCF), '4insx'.
4insx(-1cos2x + 1) = 0

Ignore the factor 4.

Subproblem 1

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