Answer
Rolle's Theorem does not apply to the function because it is not continuous on the interval $[\pi, 3\pi]$
Work Step by Step
Begin by testing continuity of the function
$f(\pi)=0$
$f(2\pi)=$ undefined
because the function is undefined at a point in the interval, Rolle's Theorem does not apply to the function even though $f(a)= f(b)$
