sin(9*x)-sin(x)=4*sin(x)*cos(2*x)*cos(x)

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Solution for sin(9*x)-sin(x)=4*sin(x)*cos(2*x)*cos(x) equation:


Simplifying
sin(9x) + -1sin(x) = 4sin(x) * cos(2x) * cos(x)

Remove parenthesis around (9x)
ins * 9x + -1sin(x) = 4sin(x) * cos(2x) * cos(x)

Reorder the terms for easier multiplication:
9ins * x + -1sin(x) = 4sin(x) * cos(2x) * cos(x)

Multiply ins * x
9insx + -1sin(x) = 4sin(x) * cos(2x) * cos(x)

Multiply ins * x
9insx + -1insx = 4sin(x) * cos(2x) * cos(x)

Combine like terms: 9insx + -1insx = 8insx
8insx = 4sin(x) * cos(2x) * cos(x)

Remove parenthesis around (2x)
8insx = 4ins * x * cos * 2x * cos(x)

Reorder the terms for easier multiplication:
8insx = 4 * 2ins * x * cos * x * cos * x

Multiply 4 * 2
8insx = 8ins * x * cos * x * cos * x

Multiply ins * x
8insx = 8insx * cos * x * cos * x

Multiply insx * cos
8insx = 8cinos2x * x * cos * x

Multiply cinos2x * x
8insx = 8cinos2x2 * cos * x

Multiply cinos2x2 * cos
8insx = 8c2ino2s3x2 * x

Multiply c2ino2s3x2 * x
8insx = 8c2ino2s3x3

Solving
8insx = 8c2ino2s3x3

Solving for variable 'i'.

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

Add '-8c2ino2s3x3' to each side of the equation.
-8c2ino2s3x3 + 8insx = 8c2ino2s3x3 + -8c2ino2s3x3

Combine like terms: 8c2ino2s3x3 + -8c2ino2s3x3 = 0
-8c2ino2s3x3 + 8insx = 0

Factor out the Greatest Common Factor (GCF), '8insx'.
8insx(-1c2o2s2x2 + 1) = 0

Factor a difference between two squares.
8insx((cosx + 1)(-1cosx + 1)) = 0

Ignore the factor 8.

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 '(cosx + 1)' equal to zero and attempt to solve: Simplifying cosx + 1 = 0 Reorder the terms: 1 + cosx = 0 Solving 1 + cosx = 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 + cosx = 0 + -1 Combine like terms: 1 + -1 = 0 0 + cosx = 0 + -1 cosx = 0 + -1 Combine like terms: 0 + -1 = -1 cosx = -1 Add '-1cosx' to each side of the equation. cosx + -1cosx = -1 + -1cosx Combine like terms: cosx + -1cosx = 0 0 = -1 + -1cosx Simplifying 0 = -1 + -1cosx 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 '(-1cosx + 1)' equal to zero and attempt to solve: Simplifying -1cosx + 1 = 0 Reorder the terms: 1 + -1cosx = 0 Solving 1 + -1cosx = 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 + -1cosx = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1cosx = 0 + -1 -1cosx = 0 + -1 Combine like terms: 0 + -1 = -1 -1cosx = -1 Add 'cosx' to each side of the equation. -1cosx + cosx = -1 + cosx Combine like terms: -1cosx + cosx = 0 0 = -1 + cosx Simplifying 0 = -1 + cosx 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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