$\lim_{x\to1}\left(\frac{1}{\ln\left(x\right)}-\frac{2}{x^2-1}\right)$
$\lim_{x\to2}\left(-x+1\right)$
$\sqrt{3}csc3x=-2$
$\int\frac{2x^6}{5}dx$
$-5c-27c+18c$
$5x^2-3x-6$
$\int\frac{sinx}{cosx-cos^2x}dx$
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