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Simplifying r = 3cos(2x) Remove parenthesis around (2x) r = 3cos * 2x Reorder the terms for easier multiplication: r = 3 * 2cos * x Multiply 3 * 2 r = 6cos * x Multiply cos * x r = 6cosx Solving r = 6cosx Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Simplifying r = 6cosx
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