Maple function dsolve
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You can use maple to solve differential equations but this gives coefficients like _C1 and _C2. Often you want to rename these to C and D. Here's a simple way of doing this in Maple T.A.
$m=maple(" expr := diff(x(t), t, t) = 2*x(t); sol:=dsolve(expr, x(t)); subs({_C1 = C, _C2 = D}, sol) ");
This results in