Express parametrically a point on a parabola (y-1)^2=x find the equation of a tangent at a point (9a,6a)
The chord joining p(ap^2,2ap) and Q(aq^2,2aq) passes through the foot of the directrix point (-a,0) show that pq=1

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

We can plant more trees and plants.