$\int\left(\frac{x^6}{8-x^7}\right)dx$
$x^2-7x-6$
$\frac{\tan\left(-x\right)+\cot\left(x\right)}{\tan\left(x\right)}=-\csc^2\left(x\right)$
$49-42+9x^2$
$-x^2-30x-825$
$-3x^2y\left(-2x^4y^2+3xy^3+4\right)$
$12x-5x+12x$
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