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Simplifying Cos2(3x) + -1sin2(3x) = 0 Remove parenthesis around (3x) os2C * 3x + -1sin2(3x) = 0 Reorder the terms for easier multiplication: 3os2C * x + -1sin2(3x) = 0 Multiply os2C * x 3os2xC + -1sin2(3x) = 0 Remove parenthesis around (3x) 3os2xC + -1in2s * 3x = 0 Reorder the terms for easier multiplication: 3os2xC + -1 * 3in2s * x = 0 Multiply -1 * 3 3os2xC + -3in2s * x = 0 Multiply in2s * x 3os2xC + -3in2sx = 0 Reorder the terms: -3in2sx + 3os2xC = 0 Solving -3in2sx + 3os2xC = 0 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-3os2xC' to each side of the equation. -3in2sx + 3os2xC + -3os2xC = 0 + -3os2xC Combine like terms: 3os2xC + -3os2xC = 0 -3in2sx + 0 = 0 + -3os2xC -3in2sx = 0 + -3os2xC Remove the zero: -3in2sx = -3os2xC Divide each side by '-3n2sx'. i = n-2osC Simplifying i = n-2osC
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