My Math Forum help please ... tangent to hyperbola ... calculus

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 May 11th, 2009, 06:25 AM #1 Newbie   Joined: Mar 2009 Posts: 16 Thanks: 0 help please ... tangent to hyperbola ... calculus Find tangents which goes through point (-2;2) to the hyperbola (x^2)/4 - y^2 = 1 ??? I dont know how to solve this because the point (-2;2) is not on hyperbola??? Thank You!
 May 11th, 2009, 11:04 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,616 Thanks: 2072 One of several methods of doing this is to find the equation of the tangent through any point (2sec(t), tan(t)) on the hyperbola, and then determine the particular cases where the tangent contains the point (-2, 2).

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