$\left(21x^2y^2-28x^3+56x^4\right)$
$\int\sqrt[2]{\left(1-cos\left(4x\right)\right)^3}dx$
$\int e^{-3x}db$
$-4n+8+9n-2$
$4x^3+3x^2$
$\int\sqrt{4-2x^2-x^4\:}x\left(x^2+1\right)dx$
$\lim_{x\to\infty}\left(\frac{3x^2+9x}{x^2-9}\right)$
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