or the following DEs find the order and decide whether they are linear or non-linear. (1) y(t) – y"(t) + vt y (t) = t° , t> 1. (2) ty"(t) + 5y' (t) = v=t, t<0 (3) y"(t) +5 y²(t) + y'(t) = t , t> 0.

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