$\int\left(\sqrt{144-9x^2}\right)dx$
$\frac{1}{cosacosb}$
$\tan\left(b\right)\sec\left(b\right)$
$3-\left(-2\right)-\left(-2+3\right)-\left(-3\right)$
$-1.5+2$
$35-8-\left(2\cdot1\right)+5\cdot\left(4-\frac{12}{6}\right)$
$\left(-16ab-3ab\right)-45ab$
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