I really need help.. I have my answers here but im not sure if they are correct:
C.x=pi/6 7/6pi 2pi pi
D.x=pi/2, 3/2pi pi/3 5/3pi
I also need these checked
Using a sum of difference identity find exact values for the following:
For problems 2 and 3 find the following.
A.cos(x-y): sin(x-y); tan (x-y); the quadrant (x-y) is in.
B.cos(x+y); sin(x+y) tan(x+y) the quadrant (x+y) is in.
2.If (pi/2)<x<pi and pi<y<(3pi/2) and cosx=-5/13 and tany=3/4
3.If pi<x< or equal too(3pi/2) and (3pi/2)<y<2pi, and secx=-41/9 and tany=-12/5
If you could show me how to do them it would be appreciated.