$\left(1+x^4\right)^2$
$\frac{3x^{4}-5x^{3}-20x-5}{3x+6}$
$secx-cosx+sinxtanx$
$\int\:\frac{1}{\sqrt{\left(3+x^2\right)^3}}dx$
$4ab^2c-6a^2b+8ab$
$\left(\sqrt{2x}-\sqrt{3y}\right)$
$\int-\frac{12}{x^2\sqrt{x^2+64}}dx$
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