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In any DeltaABC,if cos theta =(a)/(b+c...

In any `DeltaABC,if`
`cos theta =(a)/(b+c) , cos phi =(b)/(a+c) , cos Psi=(c)/(a+b)` where `theta, phi and Psi` lie between `0 and pi,` prive that
`tan ^(2)""(theta)/(2) + tan ^(2)""(phi)/(2)+ tan ^(2)""(Psi)/(2)=1`

A

3

B

`-3/2`

C

0

D

`3/2`

Text Solution

Verified by Experts

The correct Answer is:
C
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