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Simplifying cos(3x) + -1cos(x) = -2sin(2x) * sin(x) Remove parenthesis around (3x) cos * 3x + -1cos(x) = -2sin(2x) * sin(x) Reorder the terms for easier multiplication: 3cos * x + -1cos(x) = -2sin(2x) * sin(x) Multiply cos * x 3cosx + -1cos(x) = -2sin(2x) * sin(x) Multiply cos * x 3cosx + -1cosx = -2sin(2x) * sin(x) Combine like terms: 3cosx + -1cosx = 2cosx 2cosx = -2sin(2x) * sin(x) Remove parenthesis around (2x) 2cosx = -2ins * 2x * sin(x) Reorder the terms for easier multiplication: 2cosx = -2 * 2ins * x * ins * x Multiply -2 * 2 2cosx = -4ins * x * ins * x Multiply ins * x 2cosx = -4insx * ins * x Multiply insx * ins 2cosx = -4i2n2s2x * x Multiply i2n2s2x * x 2cosx = -4i2n2s2x2 Solving 2cosx = -4i2n2s2x2 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '2osx'. c = -2i2n2o-1sx Simplifying c = -2i2n2o-1sx
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