$\frac{d}{dx}\left(\frac{x^3\:+\:4}{4x-5}\right)$
$\left(3-y\right)y+7$
$\left(-2w^2xy^3\right)\left(-4w^2n^2\right)$
$11x^7+9x^3+4x^7$
$\frac{2x}{x-2}=1+\frac{x-2}{2}$
$\frac{\sec^2\left(\frac{x}{2}\right)}{2\tan\left(\frac{x}{2}\right)}$
$16m^2-40mn+25n^2$
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