$\lim_{x\to1}\left(\frac{2+\sqrt{y^2+3}}{y-1}\right)$
$-7x^{3-1}$
$4x^{-1}$
$9x^2+3x-12$
$\frac{cot\left(x\right)\:+tan\left(x\right)x}{cot\left(x\right)}$
$4^4\cdot10^4$
$6a^2b^{-4}x\:2ab^6$
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