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Simplifying 3(cos(2x)) + -5(cos(x)) + -1 = 0 Remove parenthesis around (2x) 3(cos * 2x) + -5(cos(x)) + -1 = 0 Reorder the terms for easier multiplication: 3(2cos * x) + -5(cos(x)) + -1 = 0 Multiply cos * x 3(2cosx) + -5(cos(x)) + -1 = 0 Remove parenthesis around (2cosx) 3 * 2cosx + -5(cos(x)) + -1 = 0 Multiply 3 * 2 6cosx + -5(cos(x)) + -1 = 0 Multiply cos * x 6cosx + -5(cosx) + -1 = 0 Reorder the terms: -1 + 6cosx + -5cosx = 0 Combine like terms: 6cosx + -5cosx = 1cosx -1 + 1cosx = 0 Solving -1 + 1cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 1cosx = 0 + 1 1cosx = 0 + 1 Combine like terms: 0 + 1 = 1 1cosx = 1 Divide each side by '1osx'. c = o-1s-1x-1 Simplifying c = o-1s-1x-1
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