Question 1161718
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The linear factor  2*sin(x) - 1 = 0  provides two solutions  x = 30° and x = 150° with sin(x) = {{{1/2}}}.


The linear factor  cos(x) + 1 = 0  provides one additional solutions  x = 180° with cos(x) = -1.


In all, the given equation has 3 solutions in the interval [0,180°].
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Solved.