$\left(1-\frac{x}{-6}\right)\left(1-\frac{x}{-6}\right)$
$\int sec^2\:\frac{x}{2}\:tan\frac{x}{2}\:dx$
$2\frac{dy}{dx}+6y=12\sin\left(9\cdot x\right)$
$2x^2+7x-2$
$12x^2y-3y$
$\frac{16}{3}-64+\frac{2}{3}+4$
$\lim\:_{x\to\:\:0}\left(\frac{cosxtanx}{x}\right)$
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