$4abc+8bac+abc+2abc$
$6-\left(-3\right)-1-\left(-6\right)$
$4-x\leq 73x$
$-\sin2\theta=\sqrt{2}\cos\theta$
$\tan\left(\arccos\left(x\right)\right)$
$\frac{-6x+3}{2x+1}$
$\int\:\frac{2x^2-1}{6x^3-9x}dx$
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