find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in quad IV

Answer 1

I have a feeling that you want exact values for
sin(x+t) or cos(s+t)

the way it stands, just use your calculator to find each of the angles, then add them up.

Answer 2

No it is to find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV