`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

With proper notations prove that 2(bc cosA+ac cosB+abcosC) = a^2+b^2+c^2

In Delta ABC prove that 2(bc cosA + ca cosB + ab cosC) = a^2 + b^2 + c^2

(v) 2(bc cosA + ca cosB + ab cosC) = a^(2) +b^(2)+c^(2)

Show that 2("bc"cosA+"ca"cosB+"ab"cosC)=a^(2)+b^(2)+c^(2).

In any A B C ,2(bc cosA+ ca cosB+ab cosC) =

Show that cosA/a +cosB/b +cosC/c =(a^2 +b^2 +c^2 )/2abc

In Delta ABC prove that a(b^2 + c^2) cosA + b(c^2 +a^2)cosB + c(a^2 + b^2) cosC = 3abc

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)

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