$x^4-1+5x^3-ax^2+4-11x^4-7x^3-6x$
$\left(x+\frac{2}{5}\right)\left(\frac{1}{2}x+\frac{1}{6}\right)$
$\left(\sqrt{5}\right)^2+\left(\sqrt{5}\right)^2$
$\int x^3\cos x^2dx$
$\frac{d}{dx}\sqrt{\frac{x^3-1}{x^3+1}}$
$\frac{d^2}{dx^2}\sqrt{4x-3}$
$x=4s+2t$
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