$2^2\left(-1\right)-2\left(-1\right)\:$
$\tan\left(30\right)^2+\cot\left(30\right)^2$
$\sqrt { \frac { u } { x } }$
$\sqrt[3]{2^9}$
$\sqrt{1.9^2}$
$a^3+b^3$
$\left(-3\right)\:+\:\left(-8\right)\:+\:\left(-4\right)\:-\:2\:x\:\left(-2\right)$
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