cos^2(h/2)-sin^2(h/2)-1=-2sin^(h/2)的推导是怎么来的?
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cos^2(h/2)-sin^2(h/2)-1=-2sin^(h/2)的推导是怎么来的?
cos^2(h/2)-sin^2(h/2)-1=-2sin^(h/2)的推导是怎么来的?
cos^2(h/2)-sin^2(h/2)-1=-2sin^(h/2)的推导是怎么来的?
cos^2(h/2)+sin^2(h/2)=1
cos^2(h/2)-sin^2(h/2)-1=cos^2(h/2)-sin^2(h/2)-cos^2(h/2)-sin^2(h/2)=-2sin^(h/2)