$\sec\:^2\left(\frac{\pi\:}{4}\right)+\csc\:^2\left(\frac{\pi\:}{4}\right)$
$\frac{2x}{3}-3$
$\lim_{x\to6}\left(2x^3-2x^2+x-3\right)$
$2tan\:y+sec^2y$
$3000^3$
$\frac{-x^3+3x^2+2x-6}{-7x^2-3}$
$20\left(-1.5a+0.75\right)$
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