Trig
posted by Paige .
find (s+t) given that cos s=1/3 with s in quad I and sin T=1/2 with t in quad IV

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. 
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