$49x^2-98x+49$
$3\left(4\right)-9$
$-22n-15+18n$
$\frac{\left(sin\left(a-b\right)-sin\left(a+b\right)\right)}{cos\left(a-b\right)-cos\left(a+b\right)}$
$\frac{d}{dx}\frac{1}{\frac{3}{4}}$
$\lim_{x\to2}\left(\frac{\left(2^x-4\right)}{2-x}\right)$
$\int6e^{-x}dx$
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