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Simplifying cos2(x) + -1 = 0 Multiply cos2 * x cos2x + -1 = 0 Reorder the terms: -1 + cos2x = 0 Solving -1 + cos2x = 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 + cos2x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + cos2x = 0 + 1 cos2x = 0 + 1 Combine like terms: 0 + 1 = 1 cos2x = 1 Divide each side by 'os2x'. c = o-1s-2x-1 Simplifying c = o-1s-2x-1
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