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Simplifying 2cos2x + -1cosa = 0 Reorder the terms: -1acos + 2cos2x = 0 Solving -1acos + 2cos2x = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2cos2x' to each side of the equation. -1acos + 2cos2x + -2cos2x = 0 + -2cos2x Combine like terms: 2cos2x + -2cos2x = 0 -1acos + 0 = 0 + -2cos2x -1acos = 0 + -2cos2x Remove the zero: -1acos = -2cos2x Divide each side by '-1cos'. a = 2sx Simplifying a = 2sx
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