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CBSE Class 11-science Answered

Pls answer the attached questions ASAP

Asked by hunte2931 | 17 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
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