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

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

If Delta ABC is right triangle and if angleA = (pi)/(2) , then prove that cos B - cos C = -1 + 2 sqrt(2) cos"" (B)/(2) sin"" (C )/(2) .

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

Show that suma^3cos(B−C) =3abc

If Delta is the area of a triangle with side lengths a, b, c, then show that as Delta leq 1/4 sqrt((a + b + c) abc) Also, show that the equality occurs in the above inequality if and only if a = b = c .

In a Delta ABC , If tan A/2, tan B/2, tan C/2 are in A.P. then cos A. cos B, cos C are in

The sides of triangle ABC satisfy the relations a + b - c= 2 and 2ab -c^(2) =4 , then the square of the area of triangle is ______

Solve the triangle ABC if a=5 , b=4 and angle A =60^(@ , then side c is

If Delta ABC is right triangle and if angleA = (pi)/(2) , then prove that cos^(2)B + cos^(2)C = 1

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