Question

sin(a+b)=sinacosb+cosasinb verify with the result with angle A=30°and B=60° and hence deduce sin2A​

Answer 1

Answer:

sin (a+b)=sin 90.

sin30=1/2

cos 60=1/2

sin(a+b)=sinacosb

sin 90=sin30cos60

1=1/2×1/2+√3/2×√3/2

1=1/4+3/4

1=1

proved