$\:\frac{-56}{8}$
$xy^2+y=0$
$cos2x=-0.8$
$csc\left(t+2\pi\:\right)\cdot cos\left(t+2\pi\:\right)$
$\left(x^2+2\right)\left(x^2-y^3\right)$
$\tan^3\left(x\right)\sec^2\left(x\right)-tan^3\left(x\right)$
$-5^{2}-\frac{\left(-2\right)\left(-2\right)\left(-3\right)\left(-2\right)}{\left(-6\right)\left(-4\right)}$
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