$4^0+2^{-1}$
$-1\:restar\:-9$
$1238-\left(900\right)$
$\sqrt{\frac{\sin^2\left(x\right)}{2\cos^2\left(x\right)}}$
$\int_{\pi}^{\infty}\left(\frac{1}{1+\frac{x^2}{2}+2\sqrt{x}}\right)dx$
$7z+5+6z-9$
$\lim_{x\to0}\left(\frac{3x^3}{e^{9x}}\right)$
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