$\left(8a+7ab^3\right)^2$
$\frac{d}{dx}\:y^{4\:}-2x^2+\:8xy^2+9\:=0$
$\left(1-2x\right)\cdot y-\left(ln\cdot y\right)\cdot y'=0$
$-\sqrt{3}+6.9+9-\left(-\sqrt{2}\right)$
$\left(-1238\right)+4$
$10\sqrt{x+y}=\:-\sqrt{y+x}$
$-9\:+\:t\:=\:12$
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