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Help needed: How to add constraints into FullSimplify


Hi!

I am trying to simplify a complicated expression F[x1,x2,...] using 
FullSimplify.  What I know is that the variables involved satisfy 
certain conditions. For instance, I know that 

	x1^2 + x5^2 + x7^2 = 1.

How can I supply this information into FullSimplify so that it
processes input further?

Thanks,

Ilya


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