$\left(2mn-9f+1\right)\left(7mn+4m-8\right)$
$\left(3x^2-2x\right)\left(3x^2+2x\right)$
$81\cdot45$
$\int\frac{1+\sqrt{x}}{x^3}dx$
$\cos^230$
$\int\frac{x}{\left(x^2-a^2\right)^{\frac{3}{2}}}dx$
$\frac{du}{dx}\cdot x=cos\left(u\right)$
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