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$y=c_1\cos x +c_2\sin x +e^x$

$y=c_1\cos x +c_2\sin x +2e^x$

$y=c_1\cos 2x +c_2\sin 2x +e^{2x}$

$\mbox{None of the above}$

$y=c_1\cos x +c_2\sin x +3e^x$

$y=c_1\cos 2x +c_2\sin 2x +3e^x$

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