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Simplifying (cosx + sinx)(cosx + -1sinx) = 2cos2x + -1 Multiply (cosx + insx) * (cosx + -1insx) (cosx(cosx + -1insx) + insx(cosx + -1insx)) = 2cos2x + -1 ((cosx * cosx + -1insx * cosx) + insx(cosx + -1insx)) = 2cos2x + -1 Reorder the terms: ((-1cinos2x2 + c2o2s2x2) + insx(cosx + -1insx)) = 2cos2x + -1 ((-1cinos2x2 + c2o2s2x2) + insx(cosx + -1insx)) = 2cos2x + -1 (-1cinos2x2 + c2o2s2x2 + (cosx * insx + -1insx * insx)) = 2cos2x + -1 (-1cinos2x2 + c2o2s2x2 + (cinos2x2 + -1i2n2s2x2)) = 2cos2x + -1 Reorder the terms: (-1cinos2x2 + cinos2x2 + c2o2s2x2 + -1i2n2s2x2) = 2cos2x + -1 Combine like terms: -1cinos2x2 + cinos2x2 = 0 (0 + c2o2s2x2 + -1i2n2s2x2) = 2cos2x + -1 (c2o2s2x2 + -1i2n2s2x2) = 2cos2x + -1 Reorder the terms: c2o2s2x2 + -1i2n2s2x2 = -1 + 2cos2x Solving c2o2s2x2 + -1i2n2s2x2 = -1 + 2cos2x Solving for variable 'c'. Reorder the terms: 1 + -2cos2x + c2o2s2x2 + -1i2n2s2x2 = -1 + 2cos2x + 1 + -2cos2x Reorder the terms: 1 + -2cos2x + c2o2s2x2 + -1i2n2s2x2 = -1 + 1 + 2cos2x + -2cos2x Combine like terms: -1 + 1 = 0 1 + -2cos2x + c2o2s2x2 + -1i2n2s2x2 = 0 + 2cos2x + -2cos2x 1 + -2cos2x + c2o2s2x2 + -1i2n2s2x2 = 2cos2x + -2cos2x Combine like terms: 2cos2x + -2cos2x = 0 1 + -2cos2x + c2o2s2x2 + -1i2n2s2x2 = 0 The solution to this equation could not be determined.
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