r=t*cos(2t)

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Solution for r=t*cos(2t) equation: 


Simplifying
r = t * cos(2t)

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

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

Multiply t * cos
r = 2cost * t

Multiply cost * t
r = 2cost2

Solving
r = 2cost2

Solving for variable 'r'.

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

Simplifying
r = 2cost2

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