Given that α is the angle of the second quadrant, sin α = 3 / 5, β is the angle of the third quadrant, Tan β = 4 / 3, find the value of Tan (α + β)

Given that α is the angle of the second quadrant, sin α = 3 / 5, β is the angle of the third quadrant, Tan β = 4 / 3, find the value of Tan (α + β)

α is the angle of the second quadrant, so cos α