$ax^6-5ax^4+ax^2$
$\lim_{x\to0}\left(\frac{\sqrt{15}\cos\left(x\right)-\sqrt{15}}{45x^2}\right)$
$\tan^2\left(x\right)-\tan^2\left(x\right)$
$\lim_{x\to n}\left(\frac{x^4}{e^x}\right)$
$9x^2+450x+25$
$\left(x^2+5y\right)\left(x^2-6y\right)$
$19\cdot23$
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