$\lim_{x\to1}\left(\frac{4x^2-1}{x^2-1}\right)$
$-2\cdot\frac{1}{2}$
$10-\left(1-\sqrt{2}\right)$
$\sqrt{\left(-2\right)^2-1}$
$\frac{d}{dx}\frac{\sqrt{4+2x}}{cos^4x}$
$25m^4-121f^{10}$
$\int4^{3x}dx$
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