e^{i\pi}+1=0\\ a^2+b^2=c^2\\ {a \over \sin A}={b \over \sin B}={c \over \sin C}=2R
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  1. http://formula.s21g.com/?e%5E%7Bi%5Cpi%7D+1%3D0%5C%5C%0Aa...
  2. http://formula.s21g.com/?e%5E%7Bi%5Cpi%7D+1%3D0%5C%5C%0Aa...
  3. http://arckeyrar.blogspot.com/2010/