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Question: subs or eval product with function

Question:subs or eval product with function

baustamm1 35 Maple
product eval subs
January 16 2015
1

Hello,

I have a question: why does the following not work and how can I make it work:

f(x)*a*b;
subs(a*b=y,%);

The result is f(x) a b but I want f(x) y. What can I do? I also tried eval.


Thanks and best regards.
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