RT @StackMath: Great answer: Do "imaginary" and "complex" angles exist? http://math.stackexchange.com/questions/96151/do-imaginary-and-complex -angles-exist/96159#96159 #trigonometry
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RT @StackMath: Great answer: Do "imaginary" and "complex" angles exist? http://math.stackexchange.com/questions/96151/do-imaginary-and-complex -angles-exist/96159#96159 #trigonometry