$\int\frac{\sec^{2}\left(\frac{5}{x^{2}}\right)}{x^{3}}dx$
$4\int\sec^3\text{d}\theta$
$\sqrt[2]{2}\left(x^2y^3\right)^6z^2$
$13.77+3$
$8r\:-\:\left(3s\:-\:5r\right)\:$
$-7\cdot3\cdot4$
$-20+45-30+71$
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