If a and B are angles lying in the 2nd quadrant such that cos a = -2/3 and csc B = 2, find sin(a + B) and tan(a + B).

Question

Also, what quadrant does (a+b) lie in?

Answer 1

Draw and label a diagram!

If cos a = -2/3, sin a = ?

If csc b = 2, sin b = ?, cos b = ?

Now substitute values into the appropriate formula.