Let 𝜃 be a variable in the range − 𝜋 ≤ 𝜃 < 𝜋

Q. Let 𝜃 be a variable in the range − 𝜋 ≤ 𝜃 < 𝜋.  Now consider a function

If its Fourier series is written as

then the value of 𝑚=−∞   𝑚 |𝐶₃|² (rounded off to three decimal places) is           

Ans: 0.011