calculus - How to prove that $int_{-infty}^{infty} frac{1-cos x}{x^2} dx$ equal to $pi $?

Tuesday, 7 November 2017

calculus - How to prove that $int_{-infty}^{infty} frac{1-cos x}{x^2} dx$ equal to $pi $?

How to prove that $\int_{-\infty}^{\infty} \frac{1-\cos x}{x^2} dx$ equal to $\pi $?

Is there any simple approach that does not require knowledge in Fourier Analysis or Complex analysis?

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