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Extracting coeff

beny 76
May 31 2007
0
Is it possible to make Maple give coefficient directly and without using subs of a functio when partial derivatives appears in the expression? I:= s^2*a(s,y,z)+s*U(s)*diff(a(s,y,z),s)+s^2*g(s)*diff(a(s,y,z),y); I want to exract coeff of a(s,y,z)!!! I know that I can use subs to cancel terms with partial derivatives and then use coeff, but you can imagine how much painful it could be when you have about twenty expression from wich you have to exract other coeff Thanks in advance.
derivative

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