$\cos\left(\frac{7\pi}{4}-\frac{5\pi}{6}\right)$
$\frac{x^2-1}{-x}-x$
$\frac{16x-5x^3-8+6x^4-8x^2}{2x-4}$
$\sqrt{12-2\left(4\right)}$
$\lim_{x\to0}\left(\sqrt{x}.\:sec\:\left(x\right)\right)$
$\log\left(4\right)=\log\left(x-1\right)-\log\left(3\right)$
$\left(9.0\cdot10^9\right)\left(6\cdot10^{-12}\right)\left(8\cdot10^{-12}\right)$
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