Question

EXAMPLE 17) Given that sin (A + B) = sin A cos B + cos A sin B, find the value of sin 75°.
SØLUNON Putting A 45° and B = 30° in sin (A + B ) = sin A cos B + cos A sir​

Answer 1

Answer:

Putting A = 45o and B = 30o in sin (A + B) = sin A cos B + cos A sin B , we get 

sin ( 45o+30o) = sin45o cos30o + cos45o  sin 30o

⇒sin75o=21×23+21×21=223+221=223+1