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| Question 436335:  In trigonometry, how do i know if i use sine, cosine, or tangent with a triangle?
 Answer by stanbon(75887)
      (Show Source): 
You can put this solution on YOUR website! In trigonometry, how do i know if i use sine,
 cosine,
 or tangent
 with a triangle?
 ---
 Since sine = y/r you need information about 2 of those
 components to find the 3rd.
 ---
 Since cosine = x/r you need info about 2 of those
 components to find the 3rd.
 ---
 Since tangent = y/x you need info about 2 of those
 components to find the 3rd.
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 Cheers,
 Stan H.
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