Question

If A = 30° and B = 30°, verify that sin (A + B) = sin A cos B -cos A sin B.

Answer 1

Answer:

sin (A+B)=sin 60 =

$\sqrt{3 } \div 2$

sin A cos B - sin B cos A=sin 30 cos 30-cos30 sin 30

which is equal to √3/2

Answer 2

$\sin60 = \frac{ \sqrt{3} }{2}$

$\sin30 = \frac{1}{2}$

$\cos30 = \sin60 = \frac{ \sqrt{3} }{2}$