Question

Plzzz explain this ques !!
I will mark as brainliest ans.

Answer 1

Step-by-step explanation:

We know that sum of all the interior angle of a triangle is 180.

A+B+C = 180

B+C = 180-A----------------(1)

LHS- sin(B+C/2)

sin(180-A/2)--------------from eq(1)

sin(90 - A/2)--------------- reversing the Lcm

cos A/2--------------------- Sin(90 - theta) = cos theta

cos A/2  (LHS=RHS)

Hence proved.

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and best of luck for your 10th board exams