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OpenStudy (brinazarski):
Find sinx if tanx = -1/2 and secx < 0? I got -rad5/5, but the answer is positive, why?
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OpenStudy (mertsj):
Because if the tangent is negative and the cosine (reciprocal of secant) is negative, you must be in quadrant II and the sin is positive in the second quadrant.
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