If tanA = 3/4, cosB = 9/41, where π

Question

If tanA = 3/4, cosB = 9/41, where π<A < 3π/2 And 0 <B < π/2, find tan(A +B).

Philoid · Accepted Answer

Given tanA = 3/4 And cosB = 9/41 where π

A is in third quadrant And B is in first quadrant.

Tan function And sine function are positive.

We know that