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Simplifying sin(x) * sin(2x) + cos(x) * cos(2x) = 0 Remove parenthesis around (2x) ins * x * ins * 2x + cos(x) * cos(2x) = 0 Reorder the terms for easier multiplication: 2ins * x * ins * x + cos(x) * cos(2x) = 0 Multiply ins * x 2insx * ins * x + cos(x) * cos(2x) = 0 Multiply insx * ins 2i2n2s2x * x + cos(x) * cos(2x) = 0 Multiply i2n2s2x * x 2i2n2s2x2 + cos(x) * cos(2x) = 0 Remove parenthesis around (2x) 2i2n2s2x2 + cos * x * cos * 2x = 0 Reorder the terms for easier multiplication: 2i2n2s2x2 + 2cos * x * cos * x = 0 Multiply cos * x 2i2n2s2x2 + 2cosx * cos * x = 0 Multiply cosx * cos 2i2n2s2x2 + 2c2o2s2x * x = 0 Multiply c2o2s2x * x 2i2n2s2x2 + 2c2o2s2x2 = 0 Reorder the terms: 2c2o2s2x2 + 2i2n2s2x2 = 0 Solving 2c2o2s2x2 + 2i2n2s2x2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2i2n2s2x2' to each side of the equation. 2c2o2s2x2 + 2i2n2s2x2 + -2i2n2s2x2 = 0 + -2i2n2s2x2 Combine like terms: 2i2n2s2x2 + -2i2n2s2x2 = 0 2c2o2s2x2 + 0 = 0 + -2i2n2s2x2 2c2o2s2x2 = 0 + -2i2n2s2x2 Remove the zero: 2c2o2s2x2 = -2i2n2s2x2 Divide each side by '2o2s2x2'. 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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