$\left(\left(+4\right)\cdot\left(-5\right)\right)+\left(\left(-6\right)\cdot\left(-3\right)\right)$
$s^2-4s-5$
$\sec x\sin\frac{\pi}{2}-x$
$5x^2-17-6$
$\left(\frac{2}{5}x^{2}-\frac{1}{3}y^{4}\right)^{3}$
$\left(-1250\right)+17$
$2logx+logy$
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