Suppose that A and B are both angles in the first quadrant. If

sin(A) = 1/4 and cos(B) =1/5

then compute the following:

(a) sin(A + B);

(b) sin(A B);

(c) cos(A + B);

(d) cos(A B);

(e) tan(A + B);

(f) tan(A B)