$\lim_{x\to-1}4x^2$
$\tan a=\sin a\cdot\sec a$
$\sin\left(56.3\right)$
$8^3\cdot8^0$
$3\sec^2x=7+4\tan x$
$\frac{dy}{dx}\left(\frac{x\sqrt{x^2+5}}{\left(x+2\right)^{\frac{1}{3}}}\right)$
$x-\sqrt{x-1}=1$
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