middlegirlrule9432 middlegirlrule9432
  • 09-03-2018
  • Mathematics
contestada

Verify each identity:
(tanx+tany)/(1-tanxtany)=(sinxcosy+cosxsiny)/(cosxcosy-sinxsiny),

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aencabo
aencabo aencabo
  • 18-03-2018
Solution:
(tanx + tany)/(1-tanxtany) is equal to the formula of  tan(x+y) 
sinxcosy + cosxsiny =  is equal to the formula of sin(x+y)formula 
cosxcosy - sinxsiny) = is equal to the formula of cos(x+y) 

So this means that
 tan(x+y) = sin(x+y)/cos(x+y)
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