Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Prove that cos 
cos 
cos 
= 
.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
cos 
× cos 
× cos 
cos 
= cos( π – 
) = – cos 
= – cos 
cos 
cos 
cos( α ) cos(2 α ) cos(2 2 α ) …… cos(2 n – 1 α )
= 
= – 
= – 
= 
⇒ + 
= 1 / 8.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems