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From: Chan Chun K Chan on 10 Apr 2010 04:21
suppose there's an expression y=x^4/(1+x)
if i want to substitute x^(-1) into (z+1)/z^2, how shall i do it?
i know when substituting x into (z+1)/z^2, subs(h,x,(z+!)/z^2)
but for x^(-1) this doesn't seem to work. any advice?
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