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The order of the differential equation whose solution is $\mathrm{y}=\mathrm{a} \cos \mathrm{x}+\mathrm{b} \sin \mathrm{x}+\mathrm{c} \mathrm{e}^{-\mathrm{x}}$ is
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3
$\mathrm{y}=\mathrm{a} \cos \mathrm{x}+\mathrm{b} \sin \mathrm{x}+\mathrm{c} \mathrm{e}^{-\mathrm{x}}$ Since the equation has 3 arbitrary constants, the order of differential equation is 3 .
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