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theta = atan2(
y,
x)
\theta \in [ - \pi , + \pi ]
such that
\[
\begin{array}{rcl}
\sin ( \theta ) & = & y / \sqrt{ x^2 + y^2 } \\
\cos ( \theta ) & = & x / \sqrt{ x^2 + y^2 }
\end{array}
\]
const AD<
Base> &
y
const VecAD<
Base>::reference &
y
const AD<
Base> &
x
const VecAD<
Base>::reference &
x
AD<
Base>
theta