f(x)=x^4-x^6+cos(2x)

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Solution for f(x)=x^4-x^6+cos(2x) equation: 


Simplifying
f(x) = x4 + -1x6 + cos(2x)

Multiply f * x
fx = x4 + -1x6 + cos(2x)

Remove parenthesis around (2x)
fx = x4 + -1x6 + cos * 2x

Reorder the terms for easier multiplication:
fx = x4 + -1x6 + 2cos * x

Multiply cos * x
fx = x4 + -1x6 + 2cosx

Reorder the terms:
fx = 2cosx + x4 + -1x6

Solving
fx = 2cosx + x4 + -1x6

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 2cos + x3 + -1x5

Simplifying
f = 2cos + x3 + -1x5

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