If in `Delta ABC`, `A=3C,` then `(a-c)/(2c)=`

In Delta ABC , if A = 3C " then " (a-c)/( 2c ) =

In a Delta ABC cos3A+cos3B+cos3C=1 then a) Delta ABC is right angled b) Delta ABC is acute anled c Delta ABC is obstuse angled

If in Delta ABC, c(a+b) cos ""B/2=b (a+c) cos ""C/2, the triangle is

If in Delta ABC, c(a+b) cos ""B/2=b (a+c) cos ""C/2, the triangle is

If in a Delta ABC, c(a+b) cos B//2 = b(a+c) cos C//2 , prove that the triangle is isosceles.

In Delta ABC if a to 2C and b to 3C , then cos B tends to

If : a = 2, b = 3, c = 5 in Delta ABC , then : /_C=

In Delta ABC, if (a+b+c)(a+b-c) =3ab , then C=