$\lim_{x\to0}\left(\frac{\sec\left(x\right)}{1+\tan\left(x\right)}\right)$
$\lim_{x\to1}\left(x^2+3\right)$
$y\left(x-4\right)=x\left(y-6\right)$
$\int6^{x+3}dx$
$\:-6x\:+3\left(x\:-\:2\right)\:+x\:=\:12$
$\left(-4x-5y+z\right)+\left(2x-y-2z\right)$
$\lim\:_{x\to\:\infty\:}\left(\ln\:\left(\frac{3x-1}{3x-2}\right)\left(3x-2\right)\right)$
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