If in a triangle `ABC, (s-a)/11=(s-b)/12=(s-c)/13. Then 429cot^2 ( A/2 )` is equal to

If in a triangle ABC , (b+c)/11=(c+a)/12=(a+b)/13 then cosA is equal to

If in a triangle ABC, (s-a)(s-b)= s(s-c), then angle C is equal to

In a triangle ABC , if (b+c)/(11)=(c+a)/(12)=(a+b)/(13) , then cos A=

With usual notations, if in a triangle ABC (b+c)/(11) = (c+a)/(12) = (a+b)/(13) , then cos A : cos B : cos C is :

In Delta ABC, a^(2)(s-a)+b^(2)(s-b)+c^(2)(s-c)=

If in a triangle ABC sin A = 4/5 and sin B = 12/13 , then sin C =

In Delta ABC, "cot"(A)/(2) + "cot" (B)/(2) + "cot" (C)/(2) is equal to

In a triangle ABC , if 3a = b + c , then cot B/2 cot C/2 =

In a triangle ABC , (a^2-b^2-c^2) tan A +(a^2-b^2+c^2) tan B is equal to

In triangleABC," if"(s-a)/(Delta)=1/8, (s-b)/(Delta)=1/12 and (s-c)/(Delta)=1/24 , then b=