$y=-3x^2+27x-54;x=4$
$sen\left(x\right)+2=-\frac{1}{sen\:x}$
$-x^2+10x-9\ge0$
$-\frac{54}{6}$
$\sqrt{81\sin\:^2\left(t\right)+16cos^2\left(t\right)+1296}=0$
$\sqrt[4]{\frac{16}{16z^4}}$
$c^2+10c+16$
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