$\lim_{x\to21}\left(\frac{cos\left(x\right)-cos\left(21\right)}{441-x^2}\right)$
$100\cdot0.01$
$\lim_{x\to\infty}\left(3n^{\frac{2}{n}}\right)$
$-3\:x\:\left(20\:x\:-10\right)\:+\:9$
$\int e^{2x}\csc\left(e^{2x}\right)dx$
$x^2y^2-9z^2$
$\sqrt[3]{2.7}$
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