Question

Hey...!
answer :-

Prove that cos20 cos40° cos60° cos80° = 1/16

Thank you !

Answer 1

Hey there!

Kindly refer to the following attachments for a detailed process and explanation for the following proof. The answer is proved.

$\boxed{\bf{\underline{\star \quad HENCE \: \: PROVED}}}$

Which is the required proof or the final solution for this query.

Hope this helps you and solves the doubts for proving the two given trigonometric identities!!!!

Answer 2

Refer to Attachment file!!!



Thank you!!!!