$\frac{1}{\cos\left(3x\right)}$
$\int u\cdot e^{3u}du$
$\int x^2e^xdf$
$\left(2\:+\:\frac{2}{3}\:+\frac{1}{3}=1\right)$
$5^2\cdot\left(-5\right)^3$
$\sqrt[3]{1331}$
$\frac{5u}{2}=35$
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