$x + \sqrt { x } = 30$
$\lim_{x\to0}\left(\frac{\tan\left(2x\right)}{\tan\left(5x\right)}\right)$
$\left(6x-7y\right)\left(36x^2+42xy+49y^2\right)$
$-x^2-7x-30$
$sin\left(cos^{-1}\left(4x\right)\right)$
$\frac{d}{dx}\:\frac{x^5e^x}{lnx}$
$\frac{x\:+\:4}{x^2\:+\:x\:-\:12}$
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