$\int\frac{2}{sec\:2x}dx$
$\arccos\left(0.6028\right)$
$40.07+7.87\ln\:\left(30\right)$
$\:\left(\frac{4}{3}\right)\:a^2b^7\cdot\left(\frac{1}{2}\right)a^3$
$\lim_{x\to\infty}\left(\frac{5-\sqrt{x^2-1}}{5-\sqrt{1+x^2}}\right)$
$-5x^2+5$
$\frac{x^2}{1+x^2}dx=\frac{y^2}{1+y^2}dy$
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