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how to minimize a trigonometric function with some symbol const

• To: mathgroup at smc.vnet.net
• Subject: [mg96323] how to minimize a trigonometric function with some symbol const
• From: tomt <tomtforever at gmail.com>
• Date: Wed, 11 Feb 2009 05:24:04 -0500 (EST)

f(t)=a*Sin[t] - x0)^2 + (b*Cos[t] - y0)^2.
t is variable,others is const.
0<=t<2*Pi,a>0,b>0

I have tried it again and again in mathematica ,but can't get a right result

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