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if cos of theta= -4/5 and tan of theta > 0, find sin of theta

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cos negative means quadrant II, or quadrant III.

TanTheta is >0 in first quadrant, third quadrant.
So theta is in quadrant III, which means SinTheta is negative.
if cos=4/5, sin = 3/5 but has to be negative, or sinTheta=-3/5
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