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Simplifying 2cos2(15) + -1 = 0 Reorder the terms for easier multiplication: 2 * 15cos2 + -1 = 0 Multiply 2 * 15 30cos2 + -1 = 0 Reorder the terms: -1 + 30cos2 = 0 Solving -1 + 30cos2 = 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 + 30cos2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 30cos2 = 0 + 1 30cos2 = 0 + 1 Combine like terms: 0 + 1 = 1 30cos2 = 1 Divide each side by '30os2'. c = 0.03333333333o-1s-2 Simplifying c = 0.03333333333o-1s-2
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