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Simplifying Cos(7x) * cos(4x) + sin(7x) * sin(4x) = 0 Remove parenthesis around (7x) osC * 7x * cos(4x) + sin(7x) * sin(4x) = 0 Remove parenthesis around (4x) osC * 7x * cos * 4x + sin(7x) * sin(4x) = 0 Reorder the terms for easier multiplication: 7 * 4osC * x * cos * x + sin(7x) * sin(4x) = 0 Multiply 7 * 4 28osC * x * cos * x + sin(7x) * sin(4x) = 0 Multiply osC * x 28osxC * cos * x + sin(7x) * sin(4x) = 0 Multiply osxC * cos 28co2s2xC * x + sin(7x) * sin(4x) = 0 Multiply co2s2xC * x 28co2s2x2C + sin(7x) * sin(4x) = 0 Remove parenthesis around (7x) 28co2s2x2C + ins * 7x * sin(4x) = 0 Remove parenthesis around (4x) 28co2s2x2C + ins * 7x * ins * 4x = 0 Reorder the terms for easier multiplication: 28co2s2x2C + 7 * 4ins * x * ins * x = 0 Multiply 7 * 4 28co2s2x2C + 28ins * x * ins * x = 0 Multiply ins * x 28co2s2x2C + 28insx * ins * x = 0 Multiply insx * ins 28co2s2x2C + 28i2n2s2x * x = 0 Multiply i2n2s2x * x 28co2s2x2C + 28i2n2s2x2 = 0 Solving 28co2s2x2C + 28i2n2s2x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-28i2n2s2x2' to each side of the equation. 28co2s2x2C + 28i2n2s2x2 + -28i2n2s2x2 = 0 + -28i2n2s2x2 Combine like terms: 28i2n2s2x2 + -28i2n2s2x2 = 0 28co2s2x2C + 0 = 0 + -28i2n2s2x2 28co2s2x2C = 0 + -28i2n2s2x2 Remove the zero: 28co2s2x2C = -28i2n2s2x2 Divide each side by '28o2s2x2C'. c = -1i2n2o-2C-1 Simplifying c = -1i2n2o-2C-1
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