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Simplifying cos(a + -1b) = cos(a + b) (a * cos + -1b * cos) = cos(a + b) (acos + -1bcos) = cos(a + b) acos + -1bcos = (a * cos + b * cos) acos + -1bcos = (acos + bcos) Add '-1acos' to each side of the equation. acos + -1acos + -1bcos = acos + -1acos + bcos Combine like terms: acos + -1acos = 0 0 + -1bcos = acos + -1acos + bcos -1bcos = acos + -1acos + bcos Combine like terms: acos + -1acos = 0 -1bcos = 0 + bcos -1bcos = bcos Solving -1bcos = bcos Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1bcos' to each side of the equation. -1bcos + -1bcos = bcos + -1bcos Combine like terms: -1bcos + -1bcos = -2bcos -2bcos = bcos + -1bcos Combine like terms: bcos + -1bcos = 0 -2bcos = 0 Divide each side by '-2'. bcos = 0 Simplifying bcos = 0 The solution to this equation could not be determined.
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