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Trigonometrie

 
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maria_gheorghe



Joined: 01 Mar 2017
Posts: 2
Location: Ploiesti

PostPosted: Fri May 12, 2017 7:51 am    Post subject: Trigonometrie Reply with quote

Determinati masurile unghiurilor triunghiului ABC stiind ca exista relatia:

cos ((A-B)/2)+cos((B-C)/2)+cos(3(A+C)/2)=3/2.
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