In a `DeltaA B C ,1/(1+tan^2(A/2))+1/(1+tan^2(B/2))+1/(1+tan^2(C/2))=k [1+sin(A/2) sin(B/2) sin(C/2)],` then the value of `k` is

If 2 tan^(-1)x= sin^(-1)K then the value of k is

If 2 tan ^(-1) x = sin ^(-1) k then the value of k is -

1-tan(A)/(2)tan(B)/(2)=(2c)/(a+b+c)

(1-tan^(2)45)(1+tan^(2)45)= a) tan90^0 b)1 c) sin45^0 d)0

In DeltaABC, r/r_1=1/2, then the value of tan(A/2)(tan(B/2)+tan(C/2)) must be

If A+B+C=180^(@) , (sin2A+sin2B+sin2C)/(sin A+sin B+sin C)=K sin(A)/(2)sin(B)/(2)sin(C)/(2) then the value of 3K^(3)+2K^(2)+K+1 is equal to

Prove : (1-cos^(2)A) *sec ^(2)B + tan^(2)B (1- sin^(2)A) = sin^(2) A + tan^(2)B

In any triangle A B C , prove that following : c/(a+b)=(1-tan(A/2)tan(B/2))/(1+tan(A/2)tan(B/2))

In any triangle A B C , prove that following : c/(a+b)=(1-tan(A/2)tan(B/2))/(1+tan(A/2)tan(B/2))

In any triangle A B C , prove that following : c/(a+b)=(1-tan(A/2)tan(B/2))/(1+tan(A/2)tan(B/2))