$\left(1-\frac{3}{x^2}\right)^2$
$9y^2-76y+53$
$y'=2\left(1+y^2\right)x$
$\lim\:_{x\to\:0}\left(\frac{xy}{x+y}\right)$
$\lim_{x\to0}\left(\frac{tan\left(\pi x\right)}{x}\right)$
$-2x^3+x^2-x-1;\:x=-2$
$f\left(x\right)=\frac{4}{x^3+4x}$
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