$\frac{x^2+2}{x^2+1}$
$\frac{x^4+3}{x^2}$
$6x+8xy-3x+9y+4x^2$
$2\left(z-2\right)$
$\cot\left(u\right)-1=0$
$\left(\int\sec\phi-\tan\phi\right)^2d\phi$
$x\frac{dy}{dx}+y=x^2-x+1$
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