$84+15$
$\left(\sqrt{x+2}\right)\left(\sqrt{x}-2\right)\left(x+4\right)+\left(x+4\right)\left(x-4\right)$
$2a+\left(a+\left(b-a\right)\right)+\left(\left(a-b\right)+\left(-2b+a\right)\right)$
$\frac{c^{10}d^0}{c^9d^5}$
$99.2\cdot100.8$
$-8p-10p$
$1-\cos240=\sin\left(-60\right)$
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