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How can I obtain the common tangent of two curves within

• To: mathgroup at smc.vnet.net
• Subject: [mg114904] How can I obtain the common tangent of two curves within
• From: Hongyi Zhao <hongyi.zhao at gmail.com>
• Date: Wed, 22 Dec 2010 02:35:41 -0500 (EST)

Dear all,

I've two curves corresponding to two functions, say, y=f_1(x),  and
y=f_2(x).  Now, I want to obtain the common tangent of these two
curves within mathematica? What code or commands I should use for this
purpose?  Thanks in advance.

Best regards.