$-8a\:+\:3a\:-\:6a\:+\:a\:$
$\left(8y+7z\right)\left(8y-7z\right)$
$-x^2-\frac{3}{7}x^2$
$\int56csc\left(8x\right)cot\left(8x\right)dx$
$\tan\left(c\right)+\cot\left(c\right)$
$100x^2y^6-z^4$
$\left(-19+2\right)\left(0-3\right)$
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