$66\cdot4$
$x'=x+3te^t$
$\left(x+3\right)y'+2y=2\left(x+3\right)^2$
$\lim_{n\to\infty}\:\left(\frac{2}{\sqrt{n}\left(\sqrt{n+1}-\sqrt{n}\right)}\right)$
$\int y^{-1}.e^{2y}dy$
$\int\left(2x+9\right)^{-3}dx$
$\left(\frac{1}{4}-f\right)\left(\frac{3}{2}-f\right)$
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