Question

10 If A = 60° and B = 30°, verify that
nos
Sin (A + B) = sin A cos B + cos A sin B
cos (A + B)-​

Answer 1

Answer:

cos (A+B) = cos A cos B + sin A sin B

= √3/ 2

Answer 2

Step-by-step explanation:

Given,

A= 60

B=30

L.H.S .=Sin(A+B)=Sin(60+30)=Sin90=1

R.H.S. =SinA.CosB+CosA.SinB =Sin60.Cos30+Cos60.Sin30=✓3/2×✓3/2+1/2×1/2. =3/4+1/4=4/4=1

hence , L H S.=R.H.S.