If sides of triangle ABC are a, b, and c such that `2b = a + c`, then

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 the angles A, B, and C of a triangle ABC are in AP and the sides a, b and c opposite to these angles are in GP, then a^2, b^2 and c^2 a are related as

If the angles A,B, and C of a triangle ABC are in AP and the sides a,b and c opposite to these angles are in GP,then a^(2),b^(2) and c^(2) a are related as

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

D is a point on the side BC of a triangle ABC such that /_A D C=/_B A C . Show that C A^2=C B.C D .

If a, b, c are sides of the triangle ABC and |(1,a, b),(1,c,a),(1,b,c)|=0 , then the value of cos 2A+cos 2B+cos 2C is equal to

If a, b, c are sides of the triangle ABC and |(1,a, b),(1,c,a),(1,b,c)|=0 , then the value of cos 2A+cos 2B+cos 2C is equal to

If a,b and c are the lengths of the sides of a right triangle ABC with c=2a and b^(2)-3a^(2)=0 , then angleABC=……………………