A mean-value computation whose printed option is ambiguously typeset

Let $u(r,\theta)$ be a harmonic function in the disc $D=\{(r,\theta)/0\le r<R,-\pi<\theta\le\pi\}$ such that $u$ is continuous in closed disc $\bar D$ and satisfies: $u(R,\theta)=\cos\theta, |\theta|\le\pi/3$, $=0,\ \pi/3<|\theta|\le\pi$. The mean value theorem gives the value of $u(0,0)$ as: