Question
Thu February 24, 2011 By: Rohit Kumar

prove that cos6cos42cos66cos78=1/16

Expert Reply
Thu February 24, 2011
Dear student,
 
cos6o. cos42o. cos66o. cos78o
=cos6o. cos66o. cos42o. cos78o
 
We hope that clarifies your query.
 
Regards,
Team
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