$\left(5-2a\right)\left(2a+5\right)$
$x^2y'=4x^2+7xy+2y^2$
$\cos x\left(1+\sec x\right)\left(\cos x-1\right)=\sin^2x$
$\frac{x^3+2x-1}{x+3}$
$\left(x\right)\left(x-5\right)\left(x+3\right)$
$\left(3a^{4}b^{2}\right)\left(2a^{4}b^{5}\right)$
$\lim_{x\to0}\frac{n}{\sqrt{n^3+2n-2}}$
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