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Simplifying 3cos2(9) + 3sin2(9) = 0 Reorder the terms for easier multiplication: 3 * 9cos2 + 3sin2(9) = 0 Multiply 3 * 9 27cos2 + 3sin2(9) = 0 Reorder the terms for easier multiplication: 27cos2 + 3 * 9in2s = 0 Multiply 3 * 9 27cos2 + 27in2s = 0 Solving 27cos2 + 27in2s = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-27in2s' to each side of the equation. 27cos2 + 27in2s + -27in2s = 0 + -27in2s Combine like terms: 27in2s + -27in2s = 0 27cos2 + 0 = 0 + -27in2s 27cos2 = 0 + -27in2s Remove the zero: 27cos2 = -27in2s Divide each side by '27os2'. c = -1in2o-1s-1 Simplifying c = -1in2o-1s-1
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