Source TeX:

\begin{array}{rl}P\left(\frac{-\pi}{3}\right)&=P\left(\frac{-\pi}{3}+2k\pi\right)\\[1em]P(0)&=P(2k\pi)\\[1em]P\left(\frac{\pi}{3}\right)&=P\left(\frac{\pi}{3}+2k\pi\right)\end{array}