$\lim_{x\to\infty}\:\left(2\right)^x-1$
$4r+r$
$\frac{1}{\sec\theta+\tan\theta}=\sec\theta-\tan\theta$
$8\pi\left(x-8\right)^2\left(x+8\right)$
$-26-\left(39+59\right)$
$\frac{1}{2}\pi\left(4\right)^2-\frac{3\sqrt{3}}{4}\left(1.6076\right)\:^2-2\left(1.6076\right)\:^2$
$\frac{-12a^3b^2c}{3abc}$
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