Question

sin(A+B)=24/25 and tan A=3/4 find the value of cos B

Answer 1

tan A=P/B=3/4 SO, 3^2+4^2=H^2, H=5, SIN(A+B)=24/25 WHERE SIN A= 3/5, SO SIN B=9/25 SO. COSB= 4 ROOT34/25