Question

$\large \displaystyle \sf \int_{ - \infty }^{ \infty } \prod_{k = 1}^{ \infty} \cos \bigg( \frac{x}{ {2}^{k} } \bigg) \:$
I hope you will give the answer
expecting good answer
please help
brainlians .
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Answer 1

Refer this for answer.

Hope it will help you.