trig
posted by Alexander .
Find the exact value of the trigonometric function given that
sin u = − 8/17 and cos v = − 3/5.
(Both u and v are in Quadrant III.)
cot(v − u)

cot(vu) = (cotv cotu + 1)/(cotu  cotv)
= [(3/4)(15/8) + 1] / [(15/8)  (3/4)]
= (77/32) / (3/8)
= 77/12