$\frac{d}{dx}x^2y^2=x$
$\frac{2}{x-2}+1$
$x^2+9\le-10x$
$y'=y+2$
$-10x\ge-90$
$\frac{1}{\sin^2\left(a\right)}-\frac{1}{\tan^2\left(a\right)}$
$3k^{4\:}\:.\:2k$
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