The period of y =sin 5x is
The period of y = sin x is 2π.
Then period of y=sin 5x is 2π/5 .
Let f(x)={−π,if−π<x≤0π,if0<x≤π be a periodic function of period 2π. The coefficient of sin5x in the Fourier series expansion of f(x) in the interval [−π,π] is