$\frac{d}{dx}xy+x=2y$
$\frac{\left(15+8+-2+-4+-5+6+10\right)}{7}$
$\sec^22x\tan^52x$
$\frac{10}{2x^3}$
$\frac{9x^4-100}{3x^2-10}$
$98x^2-200y^2$
$12-1600$
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