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Simplifying 3cos(2x) + 10cos(x) + -1 = 0 Remove parenthesis around (2x) 3cos * 2x + 10cos(x) + -1 = 0 Reorder the terms for easier multiplication: 3 * 2cos * x + 10cos(x) + -1 = 0 Multiply 3 * 2 6cos * x + 10cos(x) + -1 = 0 Multiply cos * x 6cosx + 10cos(x) + -1 = 0 Multiply cos * x 6cosx + 10cosx + -1 = 0 Reorder the terms: -1 + 6cosx + 10cosx = 0 Combine like terms: 6cosx + 10cosx = 16cosx -1 + 16cosx = 0 Solving -1 + 16cosx = 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 + 16cosx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 16cosx = 0 + 1 16cosx = 0 + 1 Combine like terms: 0 + 1 = 1 16cosx = 1 Divide each side by '16osx'. c = 0.0625o-1s-1x-1 Simplifying c = 0.0625o-1s-1x-1
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