$\sin\left(2x\right)-\cot\left(x\right)=-\cot x\cos\left(2x\right)$
$\left(2x+7\right)^{3x+3}$
$\lim_{x\to2}\left(\frac{2x^3-6}{x-x^2}\right)$
$\lim_{x\to0}\left(\frac{-5\sin\left(6x^6\right)}{4x}\right)$
$x-20>60$
$a^4-\:6a^2\:+\:1$
$2y\frac{dy}{dt}=12t^2$
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