cos(2x+3)=-cos(x-5)

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Solution for cos(2x+3)=-cos(x-5) equation:


Simplifying
cos(2x + 3) = -1cos(x + -5)

Reorder the terms:
cos(3 + 2x) = -1cos(x + -5)
(3 * cos + 2x * cos) = -1cos(x + -5)
(3cos + 2cosx) = -1cos(x + -5)

Reorder the terms:
3cos + 2cosx = -1cos(-5 + x)
3cos + 2cosx = (-5 * -1cos + x * -1cos)
3cos + 2cosx = (5cos + -1cosx)

Solving
3cos + 2cosx = 5cos + -1cosx

Solving for variable 'c'.

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

Add '-5cos' to each side of the equation.
3cos + -5cos + 2cosx = 5cos + -5cos + -1cosx

Combine like terms: 3cos + -5cos = -2cos
-2cos + 2cosx = 5cos + -5cos + -1cosx

Combine like terms: 5cos + -5cos = 0
-2cos + 2cosx = 0 + -1cosx
-2cos + 2cosx = -1cosx

Add 'cosx' to each side of the equation.
-2cos + 2cosx + cosx = -1cosx + cosx

Combine like terms: 2cosx + cosx = 3cosx
-2cos + 3cosx = -1cosx + cosx

Combine like terms: -1cosx + cosx = 0
-2cos + 3cosx = 0

Factor out the Greatest Common Factor (GCF), 'cos'.
cos(-2 + 3x) = 0

Subproblem 1

Set the factor 'cos' equal to zero and attempt to solve: Simplifying cos = 0 Solving cos = 0 Move all terms containing c to the left, all other terms to the right. Simplifying cos = 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 '(-2 + 3x)' equal to zero and attempt to solve: Simplifying -2 + 3x = 0 Solving -2 + 3x = 0 Move all terms containing c to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 3x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 3x = 0 + 2 3x = 0 + 2 Combine like terms: 0 + 2 = 2 3x = 2 Add '-3x' to each side of the equation. 3x + -3x = 2 + -3x Combine like terms: 3x + -3x = 0 0 = 2 + -3x Simplifying 0 = 2 + -3x 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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