$\frac{x^{-4}x^2}{x^2}$
$tana=\frac{sena}{cosa}$
$x^2+17x+72\ge\:0$
$4-100a^4$
$\sqrt{9-x}=2$
$5x=10.\left(4x-2\right)$
$\tan^5\left(x\right)-9\tan\left(^2\right)=0$
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