r=2cos(2x)

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Solution for r=2cos(2x) equation: 


Simplifying
r = 2cos(2x)

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

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

Multiply 2 * 2
r = 4cos * x

Multiply cos * x
r = 4cosx

Solving
r = 4cosx

Solving for variable 'r'.

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

Simplifying
r = 4cosx

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