" 1."x^(2)y^(2)=(x-y)^(4)

If (x+y): (x-y)= 4:1, then find the ratio (x^(2)+y^(2)):(x^(2)-y^(2))

If logy=tan^(-1)x,"then "(1+x^(2))y_(2)+(2x-1)y_(1)+4=

Prove that the radii of the circles x^(2)+y^(2)=1,x^(2)+y^(2)-2x-4y-11=0andx^(2)+y^(2)-4x-6y-243=0 are in G.P.

The centres of the circles x ^(2) + y ^(2) =1, x ^(2) + y^(2)+ 6x - 2y =1 and x ^(2) + y^(2) -12 x + 4y =1 are

The centres of the circles x ^(2) + y ^(2) =1, x ^(2) + y^(2)+ 6x - 2y =1 and x ^(2) + y^(2) -12 x + 4y =1 are

The radical centre of circles represented by S_(1)-=x^(2)+y^(2)-7x-6y-4=0,S_(2)-=x^(2)+y^(2)+10x+6y-4=0