$\left(x^2-4\right)\left(x^2-a\right)$
$\left(a+b\right)^2+19\left(a+b\right)+60$
$324x^2-49g^2$
$\frac{x^5-8x^3+x+6}{x}$
$\int\frac{\left(4x+2\right)}{x^2-x}dx$
$\sin\left(sin^{-1}0.9\right)$
$2\sqrt{27}+5\sqrt{12}-2\sqrt{147}+\sqrt{3}$
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