$\frac{d}{dx}\left(x^x\right)\left(\cos\left(6x\right)\right)^x$
$x^8-16x^4+64$
$tan\left(x+30\right)=3$
$3^{x-3}.\:9^{x-4}.27^{4-x}$
$\frac{1}{2x-4}-1$
$6x^2+4x+3x^2$
$\left(n+3a\right)\left(n-5a\right)$
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