$-9x-3$
$6 ( 7 - 3 y ) + 6 ( y + 1 )$
$\frac{cot\left(\pi-x\right)}{\sqrt{1-cos^2x}}$
$\:4k+1<9$
$-8x-4=-28$
$\sqrt{125+11\cdot4}$
$\lim_{x\to0}\left(\frac{\tan x}{x}\right)^{\frac{1}{\pi^2}}$
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