1. A hyperbola eq. was given. 4x^2 - 9y^2 =36 and the question was a tangent is drawn at any point of hyperbola. What will be the product of distances of it from the two foci?
2. A question was: - Which of the two pair intersect each other. Two equations either of circle, hyperbola, ellipse or lines were given in the options
a. sq. root 6 + sq. root 2
b. sq. root 6+ sq. root 3
c. sq. root 6 - sq. root 2
d. None of these
6. The notation dy/dx was introduced by which person ? (his name is mentioned in book, can bee seen form there)