$x^2+9+20$
$-490+15$
$\left(a^x+1\right)^2\left(a^x-1\right)^2$
$3-1\:2\:+\:x+\:1$
$\sqrt{\frac{1+x}{1-2x}}$
$x\tan\left(x\right)^2\:2x$
$\:5.5+3.5\left(39.5\right)$
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