$\frac{d}{dx}x^{-4}\cos x$
$1034-9605$
$b^2-4ac=0$
$49x^5-9x^3-15x$
$\left|2\cdot\left(-6\right)\right|\cdot\left(-7\right)$
$4x-5>3x-6$
$5x+12=2x+3$
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