$\frac{d}{dx}\tan\frac{x}{y}=2y-x$
$-2\left(-4\right)^2+10$
$9\infty$
$\left(\:3x\:+\:8y\:\right)\:\:\left(\:9x\:-\:\:7y\:\right)$
$a+2a-2$
$\frac{d^2}{dx^2}\left(4\sqrt{x-4}\right)$
$\lim_{x\to\infty}\left(\frac{x^4+x^2}{7x^5}\right)$
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