Value of the expression `(b-c)/(r_1)+(c-a)/(r_2)+(a-b)/(r_3)` is equal to 1 (b) 2 (c) 3 (d) 0

The value of (b-c)/r_1+ (c-a)/r_2+ (a-b)/r_3 is equal to

The value of (b-c)/(r_(1))+(c-a)/(r_(2))+(a-b)/(r_(3)) is equal to

In DeltaABC,(b-c)/r_1+(c-a)/r_2+(a-b)/r_3=

Show that (b-c)/(r _(1))+ (c-a)/(r _(2))+(a-b)/(r _(3)) =0

Show that (b-c)/(r _(1))+ (c-a)/(r _(2))+(a-b)/(r _(3)) =0

Show that (b-c)/(r _(1))+ (c-a)/(r _(2))+(a-b)/(r _(3)) =0.

Show that (b-c)/(r _(1))+ (c-a)/(r _(2))+(a-b)/(r _(3)) =0.

If a !=p, b !=q, c!=r and |(p,b,c),(a,q,c),(a,b,r)| = 0 then the value of (p)/(p-a)+(q)/(q-b)+(r)/(r-c) is equal to a)-1 b)1 c)-2 d)2

In a triangle A B C ,\ (r_1-r)(r_2-r)(r_3-r) is equal to 4R r^2 (b) (4a b cdot)/((a+b+c)^2) 16 R^3(cos A+cos B+cos C-1) r^3cose c A/2cose c B/2cose c C/2

Prove that : (r_1)/(b c)+(r_2)/(c a)+(r_3)/(a b)=1/r-1/(2R)