$\int 2 x ^ { 2 } e ^ { - 3 x ^ { 3 } } d x$
$17.25-7.50$
$\int tan\left(2x\right)\sqrt{sec\left(2x\right)}dx$
$\frac{6^{-2}}{6^{-2}}$
$\cos^2\left(u\right)-\sin^2\left(u\right)$
$\int_{\frac{21}{2}}^{21}\left(\sqrt{441-x^2}\right)dx$
$\left(3a^3+9b^4\right)^2$
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