$574\frac{4}{14}$
$\csc^2x-1\sec^2x=\csc^2x$
$4xy+3xy-7xy+12xy$
$-3-15^2$
$\left(+945\right)-\left(-30\right)$
$\:-13\:\cdot8$
$\int x^{21}ln\left(x^4\right)dx$
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