$128+453$
$\sqrt{x+1}-1-\left(\frac{x}{2}\right)\cdot\left(\frac{1}{x^2}\right)$
$\left(+52\right)\:x\:\left(+92\right)$
$\left(1500-1200+2700\right)$
$25a+30a$
$\lim_{x\to0}\left(\left(\frac{arctanx}{x}\right)\right)$
$\mathrm{sech}^2\left(x\right)=1$
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