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Trignometry

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 Joined: 5 Aug 2012 Post: 2
5 Aug 2012 19:34:27 IST
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TRIGNOMETRIC FUNCTION
Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Trigonometry

IF cos(A+B)/cos(A-B) =sin(C+D)/sin(C-D) THEN PROVE tanA tanB tanC + tanD=0

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Joined: 8 Oct 2011
Posts: 78
5 Aug 2012 20:44:01 IST
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Here u go: First of all, take componendo dividendo. so u'll get: (2 cosA cosB)/ (-2sinA sinB) = (2 sinC cosD)/ (2 cosC sinD). simplify the terms n u'll get d answer...

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