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If 2t a n^2alphat a n^2betat a n^2gamm...

If `2t a n^2alphat a n^2betat a n^2gamma+t a n^2alphat a n^2beta+t a n^2betat a n^2gamma+t a n^2gammat a n^2alpha=1,` prove that `s i n^2alpha+s i n^2beta+s i n^2gamma=1` .

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