Recent questions tagged proving trigonometric identities

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Sin2A+sin2B-sin2C=4cosAcosBsinC
asked Sep 10, 2013 in Trigonometry Answers by Vidyullatha | 848 views
1 answer
sec2(x)=tan2(x)tan(x)+1
asked Aug 20, 2013 in Trigonometry Answers by freedom_09 Level 1 User (200 points) | 733 views
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