if cos A = -3/5 and tan B = 8/15, where A is a second quadrant angle and B is a third quadrant angle, find
i) sin ( A + B ) (ii) cos ( A + B )
if cos A = -3/5 and tan B = 8/15, where A is a second quadrant angle and B is a third quadrant angle, find
i) sin ( A + B ) (ii) cos ( A + B )
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