$6x^{4}+9x^{3}$
$\cos^2a\tan^2a=1-\cos^2a$
$y^2+7y-44$
$2xy-y=x^2$
$y'+50y=0$
$\frac{2y'}{4x+3x^2-2}=\frac{x^3}{y^2}$
$y+9x^2y=x^2$
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