Proof of the Cofunction Identity using Right Triangle Trigonometry

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Title says it all.

  1. Mathbyfives
  2. Math
  3. by
  4. Fives
  5. proof
  6. cofunction
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LOL his voice.  but i feel you should put it on the Cartesian plain so that people can also understand the other cofunction identities like sin(x + pi/2) = cosx 

Ptro