$\int-\:\int\frac{\sqrt{1-x^2}}{x^2}\:dx$
$49a^4b^4-16c^4-16c^4$
$\lim_{x\to\infty}\left(-1+\frac{4}{n}\right)^4$
$x^2dy+\sec\left(y\right)dx=0$
$y=ty-2y+t-2$
$\left(-36\right)\:.\:-9\:+\:\left(27\right)\:.\:\left(-9\right)$
$-\left(\frac{x^2+y^2}{2xy}\right)$
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