$-6\sqrt{5}\cdot\left(-9\sqrt{7}\right)$
$3sin^2\left(4k\right)=1$
$\int x\left(4x^2+9\right)^5dx$
$5a^2-15ab+7ba-21b^2$
$\int\frac{x^2+11x}{\left(x-1\right)\left(x+1\right)^2}dx$
$y'+\frac{y}{x}=xy^2$
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