> rov:=diff(x(t),t,t,t)+3=0;

rov := (diff(x(t), `$`(t, 3)))+3 = 0

> poc1:=x(0)=5;

poc1 := x(0) = 5

> poc2:=D(x)(0)=2;

poc2 := D(x)(0) = 2

> reseni:=dsolve({rov,poc1,poc2,D(D(x))(0)=0},x(t),type=numeric,range=0..2);

reseni := proc (x_rkf45) local res, data, vars, solnproc, outpoint, ndsol, i; option `Copyright (c) 2000 by Waterloo Maple Inc. All rights reserved.`; _EnvDSNumericSaveDigits := Digits; Digits := 14; ...

> with(plots):

> odeplot(reseni);

[Plot]

>