Home
Class 12
MATHS
Show that 2("bc"cosA+"ca"cosB+"ab"cosC)=...

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

Promotional Banner

Similar Questions

Explore conceptually related problems

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

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

Show that (b+c)cosA +(c+a)cosB +(a+b)cosC =a+b+c

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

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

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

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

For DeltaABC , prove that, (cosA)/(a)+(cosB)/(b)+(cosC)/(c)=(a^(2)+b^(2)+c^(2))/(2abc) .

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

Prove that (b+c)cosA+(c+a)cosB+(a+b)cosC=2sdot