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help me


I've got to solve this problem and I don't know how to do:
"a is a real, l is a real too
Gl has this equation:
x^2 + 2 l x y - y^2 - a x = 0
A (a;0)
Find the geometric place (lieu geometrique) of the courbure center in A on
Gl
I know that it needs parametricplot, but it's not enough to resolve this...
Please help me, I need it very very importantly
Caroline
PS: excuse me for my english but I don't use to write scientific english...




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