Pls answer the attached questions ASAP

Asked by hunte2931 | 17th Jun, 2019, 04:49: PM

Expert Answer:

sin (B + C)/2 cos A/2 + cos (B + C)/2 sin A/2
= sin [(A + B + C)/2]                     sin (A + B) = sin A cos B + cos A sin B
= sin (180°/2)                               A + B + C = 180°
= sin 90° 
= 1
sin (B + C)/2 cos A/2 + cos (B + C)/2 sin A/2 = 1

Answered by Sneha shidid | 18th Jun, 2019, 10:00: AM