$\lim_{x\to-\infty\:}\left(\frac{x^3-1}{-x^2+3x-2}\right)$
$\left(3g-4f\right)^4$
$20.1-5.7$
$\left(3x\right)^2+2\left(3x\right)\cdot\left(5\right)+5^2$
$\tan\left(45-x\right)\tan\left(45+x\right)$
$\sec\left(a\right)\sqrt{1-\cos\left(a\right)^2}=\tan\left(a\right)$
$\left(6x-1\right)\left(6x+7\right)$
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