[tex]\bf \textit{the graph starts at }0\textit{ and goes to }\pi \\\\
A=\frac{\pi }{6}\textit{ now, B is away from }\pi \textit{ 1A}
\\\\
\textit{since A and B have a same y-value,}\\
\textit{and the graph is symmetric, thus}
\\\\
B=\pi -\frac{\pi }{6}[/tex]
