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Simplifying 3cos2(3x) + 3sin2(3x) = 0 Remove parenthesis around (3x) 3cos2 * 3x + 3sin2(3x) = 0 Reorder the terms for easier multiplication: 3 * 3cos2 * x + 3sin2(3x) = 0 Multiply 3 * 3 9cos2 * x + 3sin2(3x) = 0 Multiply cos2 * x 9cos2x + 3sin2(3x) = 0 Remove parenthesis around (3x) 9cos2x + 3in2s * 3x = 0 Reorder the terms for easier multiplication: 9cos2x + 3 * 3in2s * x = 0 Multiply 3 * 3 9cos2x + 9in2s * x = 0 Multiply in2s * x 9cos2x + 9in2sx = 0 Solving 9cos2x + 9in2sx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9in2sx' to each side of the equation. 9cos2x + 9in2sx + -9in2sx = 0 + -9in2sx Combine like terms: 9in2sx + -9in2sx = 0 9cos2x + 0 = 0 + -9in2sx 9cos2x = 0 + -9in2sx Remove the zero: 9cos2x = -9in2sx Divide each side by '9os2x'. c = -1in2o-1s-1 Simplifying c = -1in2o-1s-1
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