Question: Why cannot Maple solve this system of differential equations?

restart;

ode := diff(u(t),t)-f(t)=0 ,diff(f(t),t)+(t+sqrt(t^2-t*n))*f(t)=0,diff(f(t),t$2)+(1-(t+sqrt(t^2-t*n))^2)*f(t)=0;

dsolve({ode},[f(t),u(t)]);

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