$\lim\:_{x\to\:\:3}\left(\frac{\tan\:\left(x-3\right)}{x-3}\right)$
$3 x ^ { 3 } - 6 x$
$sin\left(45+\theta\:\right)-cos\left(45-\theta\:\right)$
$15x^2-14x=8$
$\frac{d}{dx}3e^{-3y}-2y^4=\frac{5x^{-2}}{y^3}+3x^4y$
$\left(3x-a\right)\left(3x+a\right)$
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