$\lim_{x\to\infty}\left(x\cdot\ln\left(\sin\left(x\right)\right)\right)$
$3x-4y=13$
$\cos75=\cos30+45$
$8\left(x-9\right)^2$
$x-4>-2$
$\int2xf^{6x}dx$
$\frac{tgx+tanx}{ctgx-tanx}$
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