$\frac{d}{dx}6^{2x+1}$
$\cos75=\cos30+45$
$\log\left(2x-1\right)+\log\left(3x-6\right)=4$
$\lim_{x\to\frac{x}{2}}\left(1-\tan\frac{x}{2}\right)\sec\left(x\right)$
$u=\frac{\left(a^{3}b\right)^{-2}\cdot\left(ab^{-2}\right)^{3}}{\left(ab\right)^{-1}}:\left(\frac{2a}{b}\right)^{-2}$
$y^{2}=\frac{x^{2}\left(x-a\right)}{x-a}$
$\int_0^tx^3\sqrt{x-3}dx$
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