In a triangle ABC, `bc co s^2 A/2 + ca co s^2 B/2 + ab co s ^2C/2 = `

Prove that in a triangle ABC, bc cos A + ca cos B +ab cos C= 1/2(a^2+b^2+c^2)

In a triangle ABC If ( 2 cos A)/a + ( cos B)/b + (2 cos C)/c = a/(bc) + b/(ca) , find the angle A.

If in a triangle ABC, 2 (cos A)/(a) + (cos B)/(b) +2 (cos C)/(c) = (a)/(bc) + b/(ca) then the value of the angle A is

In the triangle ABC if (2 cos A)/a + ( cos B)/b + (2 cos C)/c = a/(bc) + b/(ca) find the angle A.

In a triangle ABC,cos^(2)A+cos^(2)B+cos^(2)C=

In triangle ABC , prove that 2(bc cos A +ac cos B +ab cos C)=a^2+b&2+c^2 .

In triangle ABC,cos A+2cos B+cos C=2, then-

Prove that bc cos^(2).(A)/(2) + ca cos^(2).(B)/(2) + ab cos^(2).(C)/(2) = s^(2)