Question 1152699
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If cos(μ) = -sin(45°), as it is given in the condition, then there are two possibilities for μ :


    a)  EITHER  μ = 135° + n*360°,


    b)  OR      μ = 225° + n*360°,


where n is any integer number.
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Ignore the answer by @josmiceli, since it is partly incomplete and partly irrelevant.