eq1:'diff(y,t)+2*t*y;ode2(eq1,y,t);

eq2:'diff(y,t)-y/t;ode2(eq2,y,t);

eq3:'diff(y,t)+y/t;ode2(eq3,y,t);

eq4:'diff(y,t)-tan(t)*y;sol4:ode2(eq4,y,t);

ic1(sol4,t=0,y=1);

eq5:'diff(y,t)-1-t-(1+t)*y;sol5:ode2(eq5,y,t);

ic1(sol5,t=0,y=y0);

eq6:(2+t)*'diff(y,t)-2+y;sol5:ode2(eq6,y,t);

eq7:'diff(y,t,2)-3*'diff(y,t)+2*y-%e^t;ode2(eq7,y,t);

eq8:'diff(y,t,2)-y-sin(t)^2;ode2(eq8,y,t);

eq9:'diff(y(t),t)=y(t)+z(t)+sin(t);eq9bis:'diff(z(t),t)=-y(t)+3*z(t);

desolve([eq9,eq9bis],[y(t),z(t)]);