Prove that in a triangle ABC,` (cosB-cosC)/(cosA+1) =(c-b)/a`

Prove that in triangle ABC, 2cos A cosB cos Cle(1)/(4) .

In a triangle ABC cosA+cosB+cosC<=k then k=

In a triangle ABC , acosB + b cosC + c cosA =(a+b+c)/2 then

If in a triangle ABC , 2(cosA)/a+(cosB)/b+2(cosC)/c=a/(bc)+b/(ca) , then the value of the angle A, is

If in a triangle A B C , (2cosA)/a+(cos B)/b+(2cosC)/c=a/(b c)+b/(c a) , then prove that the triangle is right angled.

If in a triangle A B C , (2cosA)/a+(cos B)/b+(2cosC)/c=a/(b c)+b/(c a) , then prove that the triangle is right angled.

If an a triangle A B C ,(2cosA)/a+(cosB)/b+(2cosC)/c=a/(b c)+b/(a c), find the /_A= (a) 90^0 (b) 60^0 (c) 30^0 (d) none of these

If in a triangle ABC, (cosA)/a=(cosB)/b=(cosC)/c ,then the triangle is

For any triangle ABC, prove that (cosA)/a+(cosB)/b+(cosC)/c=(a^2+b^2+c^2)/(2a b c)

If in a triangle A B C ,(1+cosA)/a+(1+cosB)/b+(1+cosC)/c =(k^2(1+cosA)(1+cosB)(1+cosC)/(a b c) , then k is equal to (a) 1/(2sqrt(2)R) (b) 2R (c) 1/R (d) none of these