Can someone help me with this question?
Determine the exact value for each trigonometric expression, given sinA= 4/5, cos B= (-8/17),
[(pi)/2] < A < pi and (pi) < B < [3(pi)/2]
1) sin (A-B)
2) Sin (A+B)
3) cos (A+B)
4) tan (A-B)
if you could just tell me one of the answers and how you got to it, i can probably figure out the rest. thank youuuuuu!!