Question

sol it friends this question​

Answer 1

Hii

you are welcome in my ans

sum of angle of triangle

a + b + C =180

b + C = 180 - a

LHS

sin (b + C)/2

sin ( 90 - a/2)

cos(a/2).

RHS

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hope it may helps you ✊✌️

Answer 2

Answer:

angle a + angle b + angle c=180

angle b + angle c= 180- angle a now sin180/2-angle a/2= 90-angle a/2 now then use Therom sin(90-90-angle a/2)=cos a/2 mark as brainlist