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Simplifying Cosx + -1cos(2x) = 0 Remove parenthesis around (2x) osxC + -1cos * 2x = 0 Reorder the terms for easier multiplication: osxC + -1 * 2cos * x = 0 Multiply -1 * 2 osxC + -2cos * x = 0 Multiply cos * x osxC + -2cosx = 0 Reorder the terms: -2cosx + osxC = 0 Solving -2cosx + osxC = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1osxC' to each side of the equation. -2cosx + osxC + -1osxC = 0 + -1osxC Combine like terms: osxC + -1osxC = 0 -2cosx + 0 = 0 + -1osxC -2cosx = 0 + -1osxC Remove the zero: -2cosx = -1osxC Divide each side by '-2osx'. c = 0.5C Simplifying c = 0.5C
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