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

2 years 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

2 years ago

Mayank pandey

26 Points

							😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊

11 months ago

Think You Can Provide A Better Answer ?

Answer & Earn Cool Goodies

If cosx/cosy=m/n prove that mtanx +tany=(m+n)tan1/2(x+y)

2 Answer(s) Available

tan^2 x+tan^2 y+ tan^2 z =1 then what is the maximum value of 3 tanx 4ta y+ 5 tanz?

2 Answer(s) Available

Help me with the circled ones please. I have a test today. Please open the photo and check out the...

2 Answer(s) Available

View all Questions »

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn

Attractive Gift
Vouchers To Win!!! Click Here for details