$x^4-2x^2+4$
$\int\frac{x^3}{\sqrt{16+4x^2}}dx$
$\frac{a^5+1}{a+1}$
$\left(2x^2-3y^3\right)^4$
$270x-x^2-540=0$
$\csc\left(x+30\right)=2$
$5x-7>4-3x$
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