$\sec\left(66.96\right)$
$a-\frac{b^2}{a}\cdot1-\frac{b}{a+b}$
$10y-2y=64$
$1+\left(6+\right)\cdot\left(+5-6\right)$
$\frac{\left(4x^2-8x+30-x^3\right)}{x-2}$
$\frac{d}{dx}\left(ytany\right)$
$x^2+x+3x+x$
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