In any ` A B C ,` prove that: `2(b ccosA+c acosB+a bcosC)=a^2+b^2+c^2`

2(bc cosA+c acosB+a bcosC)=a^2+b^2+c^2

In any Delta A B C , prove that: 2(bc cosA+cacosB+a bcosC)=a^2+b^2+c^2

In any Delta A B C , prove that: a(b\ cos C-c cosB)=b^2-c^2

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

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

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

Prove that a(bcosC-ccosB)=b^2-c^2

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

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

In any Delta A B C , prove that: (cosA)/(bcosC+c cosB)+(cosB)/(c cosA+acosC)+(cosC)/(acosB+bcosA)=(a^2+b^2+c^2)/(2a b c)