$\frac{x^{20}-1}{x^5+1}$
$\frac{\sin^2\left(x\right)\cos\left(x\right)}{\sin\left(x\right)-sin^3x}$
$x\left(x+4\right)$
$\int\frac{1}{u^2+1}du$
$4^2+3x+-11$
$9a^212ab+4b^2$
$3x-1\le7$
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