$200m^3n^7p-100mn^2p^4$
$-4\left(8n-9\right)$
$-53-\left(-59\right)$
$w4\cdot w-10$
$\frac{1+\frac{1}{cos\:\theta\:}}{\frac{1}{sin\theta\:}}-\frac{sin\:\theta\:}{cos\theta\:}$
$-xy-3x^2-3x^2-3x$
$\left(\sqrt{a}+3\right)\left(\sqrt{a}-3\right)$
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