y=cos(2y)

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Solution for y=cos(2y) equation:


Simplifying
y = cos(2y)

Remove parenthesis around (2y)
y = cos * 2y

Reorder the terms for easier multiplication:
y = 2cos * y

Multiply cos * y
y = 2cosy

Solving
y = 2cosy

Solving for variable 'y'.

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

Add '-2cosy' to each side of the equation.
-2cosy + y = 2cosy + -2cosy

Combine like terms: 2cosy + -2cosy = 0
-2cosy + y = 0

Factor out the Greatest Common Factor (GCF), 'y'.
y(-2cos + 1) = 0

Subproblem 1

Set the factor 'y' equal to zero and attempt to solve: Simplifying y = 0 Solving y = 0 Move all terms containing y to the left, all other terms to the right. Simplifying y = 0

Subproblem 2

Set the factor '(-2cos + 1)' equal to zero and attempt to solve: Simplifying -2cos + 1 = 0 Reorder the terms: 1 + -2cos = 0 Solving 1 + -2cos = 0 Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2cos = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2cos = 0 + -1 -2cos = 0 + -1 Combine like terms: 0 + -1 = -1 -2cos = -1 Add '2cos' to each side of the equation. -2cos + 2cos = -1 + 2cos Combine like terms: -2cos + 2cos = 0 0 = -1 + 2cos Simplifying 0 = -1 + 2cos The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Solution

y = {0}

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