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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
one year ago

Answers : (2)

Sourabh Singh
IIT Patna
askIITians Faculty
2098 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
one year ago
Mayank pandey
26 Points
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8 months ago
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