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

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

Grade:11

2 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
4 years ago
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
Mayank pandey
26 Points
3 years ago
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