Trigonometric function,

• Upsilon delta (ε-δ) how to solve the problem of logic, a liberal translation
  http://tenmei.cocolog-nifty.com/matcha/2009/06/post-9307.html
  Here, you use well, from “triangular inequality”, you can call the following immediately, a liberal translation

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  Aqui, você usa-se bem, “da desigualdade triangular”, você pode chamar o seguinte imediatamente
  
  
• The Japanese pair decision? Story, a liberal translation
  http://ameblo.jp/saotome-mt/entry-10303583076.html
  Here, there is a big doubt, a liberal translation

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  Aqui, há uma dúvida grande
  
  
• 
  http://gyutetu.cocolog-nifty.com/blog/2009/10/post-653f.html
  Unless here, you must review trigonometric function simply,

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  A menos que aqui, você dever rever a função trigonométricamente simplesmente,
  
  
• May be linked to more detailed information..
  http://tenmei.cocolog-nifty.com/matcha/2011/03/post-8d6b.html
  How it does here, it divides more or less due to the person

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  Como faz aqui, divide-se mais ou menos devido à pessoa