$3x+2-2$
$\int axdx$
$\lim_{x\to0}\left(\frac{e^x\sin\left(x-x-x^2\right)}{x^2+x\ln\left(1+x\right)}\right)$
$y^2+16y$
$\tan^2\left(a\right)\left(1+\cot^2\left(a\right)\right)=\frac{1}{\cos^2\left(a\right)}$
$x^2+26x+169=0$
$-4-\:\left(23-21\right)-\left(18\right)$
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