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Question: what do you do when subs, algsubs and eval doens't work?

Question:what do you do when subs, algsubs and eval doens't work?

Greg_B 15 Maple
substitution
December 07 2012
1

Hi all,

I have a large equation where i need to substitute a part by omega but it doesn't work.
To illustrate the problem i uploaded a simplified program showing the same problem.
I know i can do it manually but since i have a lot of these substitutions I would like to do it automatically...

thanks in advance!

 
In the simple equation f I want to substitute the sqrt(g)*sqrt(m+M)/(M^(3/2)*sqrt(l) by omega so the function becomes cos(omega*t)
I already tried a lot of things but it just doens't work. Help please?


f:=cos(sqrt(g)*sqrt(m+M)/(M^(3/2)*sqrt(l))*t);
 subs(sqrt(g)*sqrt(m+M)/(M^(3/2)*sqrt(l))=omega,f);

 algsubs(sqrt(g)*sqrt(m+M)/(M^(3/2)*sqrt(l))=omega,f);
 eval(f,sqrt(g)*sqrt(m+M)/(M^(3/2)*sqrt(l))=omega);

problem.mws
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