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Simplifying sin2(3x) = 3cos2(3x) Remove parenthesis around (3x) in2s * 3x = 3cos2(3x) Reorder the terms for easier multiplication: 3in2s * x = 3cos2(3x) Multiply in2s * x 3in2sx = 3cos2(3x) Remove parenthesis around (3x) 3in2sx = 3cos2 * 3x Reorder the terms for easier multiplication: 3in2sx = 3 * 3cos2 * x Multiply 3 * 3 3in2sx = 9cos2 * x Multiply cos2 * x 3in2sx = 9cos2x Solving 3in2sx = 9cos2x Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '3n2sx'. i = 3cn-2os Simplifying i = 3cn-2os
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