Answer to Question #29145 in Trigonometry for nhardy

Question

Use the given information to calculate the exact value of the expression please help trig?

5.cosx=-√429/25 cosy=3/5 sinx=14/25 siny=4/5
a. find cos(x+y) b. find tan(x-y) c. find sin(x-y)
6. cos a=-12/16 pi/2 ≤ a ≤ pi and sin b= 6/8 pi ≤ 6 ≤ -3pi/2
a. find sin(a-b) b. find cot(a+b) c. find cos(a-b)