Math, asked by meanishasharma, 10 months ago

prove that cos3π/13+cos5π/13-2cos9π/13cos12π/13=0

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Answered by rahul200013

4

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rahul200013: Plzz check....i have changed

meanishasharma: Yes it's ok

meanishasharma: Thanks

rahul200013: Happy to help

meanishasharma: The other questions

rahul200013: Other questions also :(

meanishasharma: I have 4 more questions

meanishasharma: I have already posted those

meanishasharma: Plz check my profile

rahul200013: hmm :-( checking wait

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