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Simplifying r = 2Cos(4x) Remove parenthesis around (4x) r = 2osC * 4x Reorder the terms for easier multiplication: r = 2 * 4osC * x Multiply 2 * 4 r = 8osC * x Multiply osC * x r = 8osxC Solving r = 8osxC Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Simplifying r = 8osxC
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