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GATE (EC) 2009 old question

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The order of the differential equation d2ydt2+(dydt)3+y4=e?t $\frac{d^{2} y}{d t^{2}} + {(\frac{d y}{d t})}^{3} + y^{4} = e^{- t}$ is

(A) 1 (B) 2 (C) 3 (D) 4

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