Please see attached. I struggle with Latex so this was easier.
Any assistance much appreciated.
If by $\displaystyle a_0$ you mean the constant term then the multiplier if the integral is $\displaystyle 1/(2\pi)$ if the constant term is $\displaystyle a_0/2$ then the multiplier is $\displaystyle 1/\pi$ it all depends on how $\displaystyle a_0$ has been defined.
CB