$\lim_{x\to\infty\:}\left(\frac{14-81^{\frac{489}{x}}}{4}\right)^x$
$3x+y+z=2$
$\int\frac{4\sqrt{x}+7}{\sqrt[3]{x}}dx$
$\left(sin\left(\frac{x}{2}\right)-cos\left(\frac{x}{2}\right)\right)^2$
$e^{-2y}x\:2e^{-2y}$
$\frac{d}{dx}3cos\frac{1}{x}$
$3.14\left(2^2\right)$
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