$16a^2+24ab+ab^2$
$\cos\left(270+x\right)=\sin\left(-x\right)$
$\int\frac{6e^{2x}}{\sqrt{1-e^{2x}}}dx$
$7m-21n+42$
$\lim_{x\to2}\left(\frac{x-2}{\sqrt{x}-\sqrt{4-x}}\right)$
$\frac{9x^2-8x+1}{x}$
$4x^2-9^2+30x-25$
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