$\sqrt{16-4sinx^2}$
$4x^6+9y^4+12x^3y^2$
$\lim_{x\to\infty}\left(\frac{x}{x+13}\right)^x$
$\frac{25a^2-121}{5+11}$
$6n^2-9n$
$\left(5-2x^4\right)\left(5+2x^4\right)$
$\left(3x^4+5y^7\right)^3$
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