$\lim_{x\to0}\left(\frac{1}{\log_e\left(1+x\right)}-\frac{1}{\arctan\left(2x\right)}\right)$
$\frac{19.6}{2}$
$\frac{7a}{b}+193\frac{b}{a}$
$8.5\cdot41$
$\frac{1}{sec^2x}=\:cos^2x$
$\lim_{h\to0}\left(\frac{\sqrt{2h}}{h}\right)$
$3x^3y-18y^2$
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