$\left(-1\right)\cdot\left(-3\right)\cdot\left(-3\right)$
$\sec\left(1\right)^2+\sec\left(1\right)\cdot\tan\left(1\right)$
$\left(7a+3\right)\left(-3a+6\right)$
$f\left(x\right)=-0.5^{3x}-1$
$x^2-2x+4\le0$
$\frac{d}{dx}\left(\frac{e^{2x}-e^{-2x}}{e^{2x}+e^{-2x}}\right)$
$2^9+2^5\:=\:$
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