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How many of the below 5 DFs are linear with non-constant coefficients. yleft(frac{dy}{dx} ight)^{2}+ x=0,y''+ 2y'+ y=1,frac{d^{2}u}{dt^{2}} +frac{du}{dt}=sec{(u)},frac{dx}{dt}+ 3xt=t^{2},y'''' +3(y')^2-4y=0
How many of the below 5 DFs are linear with non-constant coefficients. y\left(\frac{dy}{dx} ight)^{2}+ x=0,y''+ 2y'+ y=1,\frac{d^{2}u}{dt^{2}} +\frac{du}{dt}=\sec{(u)},\frac{dx}{dt}+ 3xt=t^{2},y'''' +3(y')^2-4y=0
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