$6\cdot3-\left(-1\cdot6\right)+\left(3\left(-1\cdot6\right)\right)$
$\left(-5\right)\left(-2\right)\left(4\right)\left(-3\right)$
$-3cos\left(2\pi\right)$
$-39\:+\:-18\:+\:1$
$sin^2x=\frac{sec^2x-1}{sec^2x}$
$3ab^2\left(5a^2\:-\:7ab^3\right)$
$\int xsech^2xdx$
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