restart;
> deq:=x*diff(y(x),x)-y(x)*tan(x)=sec(x);
> cond:=y(0)=0;
> dsolve({deq,cond},y(x));
> 7)
> sys:=diff(x(t),t)=x(t)-3*y(t);
> sys:=diff(y(t),t)=3*x(t)+y(t);
> dsolve({sys},{x(t),y(t)});
8)
> sys:=diff(x(t),t)=2*x(t)+y(t);
> sys:=diff(y(t),t)=3*x(t)+4*(t);
> dsolve({sys},{x(t),y(t)});
9)
> sys:=diff(x(t),t)=x(t)-y(t)+z(t);
>
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