$3\sqrt[5]{x+2+9=30}$
$\sec\left(a\right)\sqrt{1-\cos\left(a\right)^2}=\tan\left(a\right)$
$-6+\left(-4\right)-\left(-7\right)-4$
$\frac{2}{x-1}-\frac{1}{x-2}$
$\log_{x+4}\left(3x^2+16\right)=2$
$48-24x+3x^2\:$
$2x^2-4x+7=0$
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