Cos theta into cos 2 theta into cos 3 theta is equal to 1 by 4 solve

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Mayank Srivastava answered this

Dear Student,

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Question

Cos theta into cos 2 theta into cos 3 theta is equal to 1 by 4
solve

Mayank Srivastava · Accepted Answer

Dear Student,
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5d1c7b8e24652%20jpg">

Regards