Question

Give sin(A+B)=56/65 and sinA=3/5 Find cosB​

Answer 1

Answer:0.9232

Explanation:

Sin(A+B)=56/65 A+B=sin^(-1)56/65 A+B=59.5

SinA=3/5 A=sin^(-1)3/5 A=36.9

Since A+B=59.5 we substitute A=36.9 in the equation

36.9+B=59.5

B=59.5-36.9

B=22.6

CosB=cos22.6=0.9232