$\frac{d}{dx}\sqrt{cos^5x+6}$
$\int\frac{1}{u\left(u^k+1\right)}dx$
$2x+23=-9$
$x^2-12x+3\le0$
$\left(x+4\right)\left(x-1\right)<\:0$
$3z^2=108$
$5cotx+4=-1$
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