In any `DeltaABC`, prove that : `(b+c) cos A + (c+a) cos B + (a+b) cos C = a+b+c`

In any triangle ABC, prove that : (b + c) cos A + (c + a) cos B + (a + b) cos C=a+b+c .

In any Delta ABC, prove that :(b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c

In any DeltaABC , prove that : (b^2 - c^2) cos 2A + (c^2 - a^2) cos 2B + (a^2 - b^2) cos 2C =0

In any DeltaABC , prove that : (cos A)/(b cos C + c cos B) + (cos B)/(c cos A + a cos C) + (cos C)/(a cos B + b cos A) = (a^2 + b^2 + c^2)/(2abc)

In any DeltaABC , prove that : a cos A + b cos B + c cos C = 2a sin B sin C

In any DeltaABC , prove that : a^2 +b^2 +c^2 = 2 (bc cos A + ca cos B + ab cos C) .

In any DeltaABC , prove that : (cos A)/a + a/(bc) = (cos B)/b + b/(ca) = (cos c)/c + c/(ab)

For any DeltaABC , prove that a(b cos C -c cos B) = b^2 - c^2

In any A B C , prove that: (b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c

In any o+ABC, prove that: (b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c