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September 6th, 2013, 01:56 AM  #1 
Member Joined: Aug 2013 Posts: 69 Thanks: 0  Derive Tangent add/sub formula. Double angle
1) How to derive tan(s+t) = tanx + tany/ 1tanx tany tan(st) = tans  tant/ (1 + tans tan t) : sin(x+y)/cos(x+y) = sinxcosy+cosxsiny/cosxcosysinxsiny 2)How to derive the double angle formula tan2s = 2tans/1tan^2s zen~ 
September 6th, 2013, 06:07 AM  #2  
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: Derive Tangent add/sub formula. Double angle Quote:
(That is, divide both numerator and denominator by .) Quote:
 

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