$\frac{2}{3}\left(2.1972\right)$
$2+2\sqrt{2xy}+2y$
$\left(-7\right)\left(-2\right)\left(-7\right)$
$8a+6a$
$\frac{d^4y}{dx^4}-4y=0$
$e^{-\ln\left(1+x^2\right)}$
$-\:\int_{\infty}^e\frac{1}{x\left(ln\:x\right)^2}\:dx$
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