Prove that 2cos(π/13)cos(9π/13) + cos(3π/13) + cos(5π/13) = 0

+9 votes
1,680 views
asked Dec 25, 2016 in Mathematics by sforrest072 (157,439 points) 61 410 938

1 Answer

+5 votes
answered Dec 25, 2016 by vikash (21,277 points) 4 19 70
 
Best answer

Proof is given below:

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

One Thought Forever

“There is a close connection between getting up in the world and getting up in the morning.“
– Anon
~~~*****~~~

...