$\lim_{x\to0}\left(\frac{x^{logx}}{x^2}\right)$
$\frac{1}{\cosh\left(x\right)-1}+\frac{1}{\cosh\:\left(x\right)-1}$
$\frac{3^2}{4}-ab+b^2$
$\lim_{x\to2}\left(\frac{1-\sqrt{x+1}}{x-2}\right)$
$10y+84+256$
$21-1.-35-60$
$-6a=-10-7a$
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