$\left(x^{-1}-y^{-1}\right)^3$
$10x-11y=10$
$\lim_{x\to4}\left(\frac{x^2-4}{x-2}\right)$
$\int sec\left(15x-1\right)tan\left(15x-1\right)dx$
$\int\:-4x\:dx$
$4x-2y^2=0$
$\left(sen\:t-tcos\:t\right)^2$
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