$9x\left(-c-d\right)$
$\int_{-\infty}^{-4}\frac{-4}{x^2}dx$
$81a^2-36ac+4c^2$
$4\:\cot x+5=9$
$14\cdot17$
$\int_{\sqrt{2}}^2\left(\frac{-1}{\left(x^2+2x+2\right)^2}\right)dx$
$-6\left(-2x-3\right)$
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