$x+y-2x-2y$
$7+4+5$
$\int9dn$
$\tan\left(\frac{1}{2}\right)\left(a-b\right)$
$\left(5x-\frac{7}{2}\right)\left(5x+\frac{7}{2}\right)$
$\cos\left(-x\right).\tan\left(x\right).\csc\left(-x\right).\sec\left(-x\right)$
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