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Question: subs not work in this case

Question:subs not work in this case

ComputerUser 535
dsolve subs
October 20 2015
0

dsol := dsolve([eq2=diff(s(t),t), eq3=diff(s(t),t), eq4=diff(s(t),t)], [a(t),b(t),c(t)]);
eval(subs(t(t)=t,subs(_C1(t) = _C1, subs(_C2(t) = _C2, subs(_C3(t) = _C3, sol1)))));

 

after subs t(t) = t , it still  have t(t)
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