$x-5=13$
$\frac{a^3-27b^3}{a-9b}$
$2mn+9m^2+\frac{2^2}{2}$
$\cos\left(a+b\right)=\cos\left(a\right)\cos\left(b\right)\left(1-\tan\left(a\right)\tan\left(b\right)\right)$
$\sin4x-\sqrt{2}\sin2x=0$
$\int\frac{\arctan^3\left(x\right)}{\left(1+x^2\right)}dx$
$\left(\frac{x^2}{3}\right)=5x$
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