α and β are acute angles in quadrant I, with sin α = 7/25 and cos B = 5/13. Determine the value of sin (α + β)
The answer is 323 / 325
I started with
sin (α + β) = sin α cos β + cos α sin β
α = 7/25
B = 5/13
sin (7/25) cos (5/13) + cos (7/25) sin (5/13)
Is that even right? If so, where do you go from there?