$y'=y\:\tanh x$
$\lim_{n\to\infty}\left(\frac{\left(n+1\right)^n}{5\cdot n^n}\right)$
$\sqrt{2x\cdot\sqrt{8x^3}}$
$\frac{d}{dx}\:5\:sec\:3x^8$
$3x+4x-9x$
$6<2-a$
$x^2+2=6x$
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