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Simplifying cos(7x) * cos(4x) + sin(7x) * sin(4x) = 0 Remove parenthesis around (7x) cos * 7x * cos(4x) + sin(7x) * sin(4x) = 0 Remove parenthesis around (4x) cos * 7x * cos * 4x + sin(7x) * sin(4x) = 0 Reorder the terms for easier multiplication: 7 * 4cos * x * cos * x + sin(7x) * sin(4x) = 0 Multiply 7 * 4 28cos * x * cos * x + sin(7x) * sin(4x) = 0 Multiply cos * x 28cosx * cos * x + sin(7x) * sin(4x) = 0 Multiply cosx * cos 28c2o2s2x * x + sin(7x) * sin(4x) = 0 Multiply c2o2s2x * x 28c2o2s2x2 + sin(7x) * sin(4x) = 0 Remove parenthesis around (7x) 28c2o2s2x2 + ins * 7x * sin(4x) = 0 Remove parenthesis around (4x) 28c2o2s2x2 + ins * 7x * ins * 4x = 0 Reorder the terms for easier multiplication: 28c2o2s2x2 + 7 * 4ins * x * ins * x = 0 Multiply 7 * 4 28c2o2s2x2 + 28ins * x * ins * x = 0 Multiply ins * x 28c2o2s2x2 + 28insx * ins * x = 0 Multiply insx * ins 28c2o2s2x2 + 28i2n2s2x * x = 0 Multiply i2n2s2x * x 28c2o2s2x2 + 28i2n2s2x2 = 0 Solving 28c2o2s2x2 + 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. 28c2o2s2x2 + 28i2n2s2x2 + -28i2n2s2x2 = 0 + -28i2n2s2x2 Combine like terms: 28i2n2s2x2 + -28i2n2s2x2 = 0 28c2o2s2x2 + 0 = 0 + -28i2n2s2x2 28c2o2s2x2 = 0 + -28i2n2s2x2 Remove the zero: 28c2o2s2x2 = -28i2n2s2x2 Divide each side by '28o2s2x2'. c2 = -1i2n2o-2 Simplifying c2 = -1i2n2o-2 Combine like terms: -1i2n2o-2 + i2n2o-2 = 0 c2 + i2n2o-2 = 0 The solution to this equation could not be determined.
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