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