In a triangle ABC, if a = 2, b = 3 and `c=4`, then cos A is equal to

In Delta ABC , if a= 2, b= 3 , c=4 then cos A =

In triangle ABC, a = 2, b = 3,c = 4 , then the value of cos A is

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

In a triangle ABC, if 2 a cos ( B − C 2 ) = b + c , then secA is equal to :

In a triangle ABC, if 2a cos ((B-C)/(2))=b+c , then secA is equal to :

In a triangle ABC, if 2a cos ((B-C)/(2))=b+c , then secA is equal to :

In Delta ABC , if the sides are a = 3, b = 5 and c = 4 , then sin . B/2 + cos . B/2 is equal to

In Delta ABC if a =2, b= 3, c = 4 then cos A + cos B + cos C =

(i) If a:b:c= 2:3:4 and s=27 inches, find the area of the triangle ABC. (ii) If in a triangle ABC, a=6, b=3 and cos(A-B) =4/5 then find its area.