$\lim_{x\to1}\left(\frac{-2x}{\cos\left(\pi x\right)\cdot\pi}\right)$
$\cot2x-\csc2x$
$\log\left(x^2-3x+3\right)=0$
$3x+9>54$
$-2\left(-6y+1\right)+-2\left(9y-8\right)$
$+119+139+97-245-315-63$
$0-\left(-1950\right)+987-\left(-342\right)$
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