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frac{3pi }{2}<alpha<2pi\\frac{3pi }{4}<frac{alpha }{2}<pi\\Sin(pi-frac{alpha }{2})=Sinfrac{alpha }{2}>0\\Sinfrac{alpha }{2}=sqrt{frac{1-Cosalpha }{2} }=sqrt{frac{1-frac{1}{2} }{2} }=sqrt{frac{1}{4} } = frac{1}{2}=0,5

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