$\lim_{x\to1}\log\left(x\right)\log\left(x-1\right)$
$\:155=35x+15$
$200x^5-50x^4-100x^3+100x^3$
$\csc\left(cx\right)-\cos\left(cx\right).\cot\left(cx\right)$
$\left(4x+yz\right)\left(4x-yz\right)$
$4+4+4+4+4$
$\int\frac{lnx}{x\left(1+ln^2\right)}dx$
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