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Question: How to make constants?

Question:How to make constants?

ComputerUser 535 Maple
October 20 2015
0

_C1, _C2, _C3 are constant, how to set them constant, to make diff(_C2) = 0 etc

eval(simplify(subs(a=_C1,subs(b=1/(diff(c(t), t)),subs(c=_C2+_C3*exp(-t),eq2)))));

(diff(_C2(t), t)+(diff(_C3(t), t))*(exp(-t))(t)+_C3(t)*(diff((exp(-t))(t), t)))*(-(diff(_C1(t), t))*(diff(diff((c(t))(t), t), t))/(diff((c(t))(t), t))^2+(diff(s(t), t))/(diff((c(t))(t), t)))
a
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