Question

\frac{1}{2} \pi \cos(\frac{k\pi}{n})

Answer 1

\frac{1}{2} \pi \cos(\frac{k\pi}{n})

Answer 2

The expression is a mathematical term dependent on integers $k$ and $n$. Its value is constrained by the cosine function, which ranges from -1 to 1, thus bounding the entire expression between $[-\frac{\pi}{2}, \frac{\pi}{2}]$. Specific evaluation requires concrete values for $k$ and $n$.