Let alpha and beta be angles such that P is the terminal point for alpha and Q is the terminal point for beta, and let R,S,T,U be the same as above:
Say that cos(alpha)=12/13 and cos(beta)=-4/5. Then if R = (r1,r2) and S= (s1,s2)enter r1,r2,s1,s2.
\((r_1, r_2, s_1, s_2) = (-20/29, 21/29, -35/37, 12/37)\)
