$2\left(y+2\right)\cdot x$
$4x-9x+2$
$x+3>-2$
$\left(32\right):8$
$\frac{1+\sin\left(x\right)}{1-\sin^2\left(x\right)}$
$cos4x=-\frac{1}{2}$
$\left(-3\right)\cdot\left(-2\right)+\left(+3\right)-\left(+4\right)$
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