D David New member Nov 18, 2012 #1 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 )
