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Suppose is an angle such that cos(?)=-1/7A)If 2? <?< 3?,then cos(?/2)=__and sin(?/2)=__

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Suppose is an angle such that cos(?)=-1/7A)If 2?

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Suppose is an angle such that cos(?)=-1/7A)If 2? <?< 3?,then cos(?/2)=__and sin(?/2)=__

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