The curves `ax^2+by^2=1` and `Ax^2+By^2=1` intersect orthogonally, then

If the curves x^2+py^2=1 and qx^2+y^2=1 are orthogonal to eeach other, then

S.T the curves y^(2)=4(x+1), y^(2)=36(9-x) intersect orthogonally.

IF the tangent at a point on the curve x^(2//3)+y^(2//3)=a^(2//3) intersects the coordinate axes in A and B then show that the length AB is a constant.

The condition that the two curves y^2=4ax,xy=c^2 cut orthogonally is

If the pair of line ax^2+2hxy+by^2+2gx+2fy+c=0 intersect on the y-axis, then