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Simplifying 9cos2(x) + -5 = -1 Multiply cos2 * x 9cos2x + -5 = -1 Reorder the terms: -5 + 9cos2x = -1 Solving -5 + 9cos2x = -1 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 9cos2x = -1 + 5 Combine like terms: -5 + 5 = 0 0 + 9cos2x = -1 + 5 9cos2x = -1 + 5 Combine like terms: -1 + 5 = 4 9cos2x = 4 Divide each side by '9os2x'. c = 0.4444444444o-1s-2x-1 Simplifying c = 0.4444444444o-1s-2x-1
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