if the radius of a circle touching
parabola y^2 =4x at (4,4)and having
directrix of y^2 =4x as its normal
is r, then find [r]?
(where [x] denote greatest integer
lessthan or equal to x)
a parabola y=x^2 −15x+36 cuts the
x axis at P and Q. a circle is drawn
through P and Q so that the origin
is outside it. then find the length
of tangent to the circle from (0,0)?