$6x-7x^2+x^3$
$\frac{5}{4-x^2}\:,\:c=0$
$2\sin\left(x\right)^2+2\sin\left(x\right)+1=0$
$\left(5-3y^2\right)^2$
$2\int\ln\left(x\right)dx$
$\lim_{x\to0}\left(\frac{x^2-4x-3}{x^2-1}\right)$
$5x+1x$
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