Cambridge Additional Mathematics

408 Applications of differential calculus (Chapter 14)

ii Suppose a 6 =0and that

Q(c,f(c)) is another point

on the parabola such that the

tangents from P and Q are

perpendicular. Show that the

intersection of the tangents

occurs on the directrix.

y

O x

P

Q

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Additional Mathematics
Y:\HAESE\CAM4037\CamAdd_14\408CamAdd_14.cdr Monday, 7 April 2014 1:22:45 PM BRIAN