$\sqrt{-56}$
$cotx=sinxsin\left(\frac{\pi\:}{2}-x\right)+cos^2x\left(\frac{1}{tanx}\right)$
$\left(\left(3^{-1}\right)^{-1}\right)^{-1}$
$-50-xy$
$6x^2-64<0$
$\int_{-2}^23x\left(x-4\right)dx$
$18:6-\left(7+4\right)-9-3-\left(5\cdot6\right)$
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