$\left(3-x^2\right)\left(x^3-x+1\right)$
$-\sqrt{841}$
$\lim_{x\to4}\left(\frac{x-3-\sqrt{\left(x^2-15\right)}}{\left(x-4\right)}\right)$
$\lim_{x\to0}\left(\frac{x^2+x+1}{e^x}\right)$
$\int\frac{\sin\left(7x\right)}{\cos\left(7x\right)-1}dx$
$\lim_{x\to0}\left(x^4ln\left(cos\left(\frac{1}{x}\right)\right)\right)$
$\frac{2}{5}\log_c\left(64\right)$
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