f^8(x)=cos(2x)

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Solution for f^8(x)=cos(2x) equation: 


Simplifying
f8(x) = cos(2x)

Multiply f8 * x
f8x = cos(2x)

Remove parenthesis around (2x)
f8x = cos * 2x

Reorder the terms for easier multiplication:
f8x = 2cos * x

Multiply cos * x
f8x = 2cosx

Solving
f8x = 2cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f8 = 2cos

Simplifying
f8 = 2cos

Reorder the terms:
-2cos + f8 = 2cos + -2cos

Combine like terms: 2cos + -2cos = 0
-2cos + f8 = 0

The solution to this equation could not be determined.

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