$\left(\frac{a}{2}+5y\right)\left(\frac{a}{2}-5y\right)$
$\left(x^{-2}+y^{-3}\right)\left(x^{-3}-y^{-3}\right)$
$S=\frac{tg\left(180^{\circ\:}-x\right)}{tg\left(-x\right)}+\frac{sec\left(180^{\circ\:}+\theta\:\right)}{csc\left(90^{\circ\:}+\theta\:\right)}$
$\frac{1}{\cos\left(x\right)^4}$
$\frac{dy}{dx}=x\cdot\left(1-x\right)$
$48x^2+12x-90$
$4\cdot075$
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