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parametric equations (2 Viewers)

maths lover

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p(2ap,ap^2) and q(2aq,aq^2) are variable points on the parabola x^2=4ay. so that angle pqr=90. the tangents at p and q meet at t. find the locus of t.
i know the process of doing these types of question i got up to
0=x(p-q)-a(p^2-q^2) and i know that you will end up getting that pq=something but i just can seem to get rid of the parameters.
 

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