If in a triangle ABC `, a=15 , b= 36 , c = 39` then ` sin"" (C )/(2)`=

If in a triangle ABC , a=5,b=4 ,A = (pi)/( 2) +B then C

In a triangle ABC , a =2,b=3 and sin A = (2)/(3) then cos C=

If in the triangle ABC , B = 45^@ , then a^4 + b^4 +c^4 =

If in a triangle ABC, (1 + cos A)/(a) + (1 + cos B)/(b) + (1+ cos C)/(c) = (k^(2) (1 + cos A) (1 + cos B) (1 + cos C))/(abc) , then k is equal to

In a triangle ABC , (c^2 +a^2 -b^2)/(2ca) is:

in a triangle ABC , ( cos A)/(a) = (cos B )/( b) = ( cos C )/( c ) if a=(1 )/( sqrt(6)) then the area of the triangle ( in square units ) is

In triangle A B C ,a , b , c are the lengths of its sides and A , B ,C are the angles of triangle A B Cdot The correct relation is given by (a) (b-c)sin((B-C)/2)=acosA/2 (b) (b-c)cos(A/2)=as in(B-C)/2 (c) (b+c)sin((B+C)/2)=acosA/2 (d) (b-c)cos(A/2)=2asin(B+C)/2

IF in triangle ABC a cos ^2 ((C )/(2 )) c cos ^2 ((A) /(2 )) = (3 b)/(2) then the sides a,b,and c

If the sides of Delta ABC are a = 4, b = 6 , c = 8 , then show that 4 cos B + 3 cos C = 2.

In any triangle ABC ,c^2 sin 2 B + b^2 sin 2 C is equal to