two points P(6p,3p^2) and Q(6q,3q^2) lie on the parabola x^=12y
a) find the equation of the tangent at p
b) the tangents at p and q intersect at the point t, find the coords of the point t
c) if the angle between these tangents is 45 degrees prove that p-q=pq+1
i've done part a) and b) however...