$\frac{12x^3}{x-3}$
$\frac{1+tan\left(\alpha\:\right)}{1-tan\left(\alpha\:\right)\:}+\frac{1-tan\left(\alpha\:\right)}{1+tan\left(\alpha\:\right)}=\frac{2}{cos\left(2\alpha\:\right)}$
$\left(a^{x+1}+a^{x-2}\right)^2$
$\frac{d}{dx}\ln\left(x^4\right)$
$\ln\left(x+y\right)=x$
$55:1.67^2$
$x^2-2x-169$
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