Prove that in a ∆ABC, (cos^2 (b-c)/2)/(b+c)^2 + (sin^2 (b-c)/2)/(b-c)^2 =1/a^2

Shiv Grade: 11

        Prove that in a ∆ABC, (cos^2 (b-c)/2)/(b+c)^2 + (sin^2 (b-c)/2)/(b-c)^2 =1/a^2

3 years ago

Answers : (2)

Sourabh Singh

IIT Patna

askIITians Faculty

2109 Points

							Hii

use the cos and sin half angles formula in terms of sides of a triangle and just insert values over here you will get the answer

3 years ago

Mayank pandey

26 Points

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2 years ago

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