At each of the points \((2, 2, \frac{\pi}{2})\), \((\frac{\pi}{4}, \frac{\pi}{4}, 2\pi)\), \((-6, 6, \frac{5\pi}{6})\), evaluate the function \(w(r, s, t) = \frac{r - s}{\sin(t)}\) or indicate that the function is undefined there.\newline(Use symbolic notation and fractions where needed. If the function is undefined at the given point, type UNDEFINED.)\newline\(w\left(2, 2, \frac{\pi}{2}\right) = \)\newline\(w\left(\frac{\pi}{4}, \frac{\pi}{4}, 2\pi\right) = \)\newline\(w\left(-6, 6, \frac{5\pi}{6}\right) = \)
