How to substitue a function into an equation?

• Subject: How to substitue a function into an equation?
• From: Wang Yuheng
• Date: Thu, 23 Nov 2006 14:16:10 +0800

I'm a beginner.
There is an equation:
f(x(t),y(t),z(t))=0
I have already get the forms of x(t) and y(t), thus I can get z(t) from 
the equation above. But I don't know which command I should use. Can 
somebody tell me?

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