$\frac{3}{\ln\left(x\right)}-\frac{4}{x-1}$
$6-y^2=x$
$f\left(x\right)=3x^4+5x^2-\frac{4}{3}x+12$
$2\tan\left(2x\right)-4\tan\left(4x\right)$
$32mn^2,12m^2n^228mn$
$\lim_{x\to1.9}\left(\sqrt{\frac{2+x}{2-x}}\right)$
$\int_0^{\frac{n}{2}}\sin dx$
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