$u-9.47=8.38$
$\left(7-s\right)^4$
$\left(sen^2-cos^2x\right)+4sen^2x\:.cos^2x$
$x^2+4x=5$
$\left(\frac{1}{243}\right)^{-0.2}-\left(\frac{1}{32}\right)^{\frac{3}{5}}+\left(-\frac{1}{27}\right)^{-0.3}$
$1.2\cdot6$
$-\:4x^2\:+\:8\:=\:0$
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