$\lim_{x\to4}\left(\frac{\sin\left(x\right)-\sin\left(4\right)}{x-4}\right)$
$\int\frac{1}{\left(x-1\right)\sqrt{x^2-2x-4}}dx$
$\left(3x^2+7y^3\right)\left(9x^4-21x^2y^3+49y^6\right)$
$8x^2-28xy+98y^2$
$4x^{2}+4x$
$9x^{6}-12x^{3}+4$
$\frac{y^2-y\:}{y^2-1}$
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