If `|r|<1,` then the sum of infinite terms of G.P is

If nger , then ""^(r)C_(r)+""^(r+1)C_(r)+""^(r+2)C_(r)+......+""^(n)C_(r) is equal to

Formula OF R || r || r1 r2 and r3 with ProOF

If r/(r_(1))=(r_(2))/(r_(3)) , then

If r_(1),r_(2),r_(3),r are in usual notation in Delta ABC then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=

If r_(1),r_(2),r_(3) are the radii of the escribed circlesof a Delta ABC and ifr is the radius of its incircle then r_(1)r_(2)r_(3)-r(r_(1)R_(2)+r_(2)r_(3)+r_(3)r_(1))=

The radii of the escribed circles of DeltaABC are r_a ,r_b and r_c. respectively.If r_a +r_b= 3R and r_b+r_c = 2R, then the smallest angle of the triangle is

If D_(r)=|[r, r-1, -r], [r+1,r,1-r],[1,2,1]| , then sum_(r=1)^(10)D_(r) is equal to

If r,r_(1) ,r_(2), r_(3) have their usual meanings , the value of 1/(r_(1))+1/(r_(2))+1/(r_(3)) , is