$\frac{dy}{dx}=\frac{y^2-2}{2x^2y}$
$tan\left(x\right)\:+\:tan\left(y\right)\:=\:\frac{sin\left(x\:+\:y\right)}{cos\left(x\right)\:cos\left(y\right)}$
$6\left(6\right)\left(-6\right)$
$26\cdot4$
$\frac{x^2}{4+x^2}$
$4\left(2\cdot3^{-2}\right)^{-2}$
$\int e^{x^4}dx$
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