Question

13. If A = B= 30 , verify that :Sin(A + B ) = sin A cos B + cosA sinB

Answer 1

sin(60°)= sin30° x cos 30° + cos 30° x sin 30
sin root 3/2= 1/2 x root3/2 + root3/2 x 1/2
R.HS
ROOT 3/4 + ROOT3/4
2ROOT3/4
ROOT3/2= L.H.S
HENCE PROVED