$2.8-1.9$
$\left(q+4\right)\left(q-9\right)$
$2x-1-x+5$
$6\sin^2x-10\sin x-5=0$
$-5\::\:-5$
$\frac{\left(x^3-4\right)}{\left(x+1\right)}$
$\int\frac{-10x+4}{x^3}dx$
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