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if 2costheta=x+1/x , 2cos fai=y+1/y,2cossai=z+1/z then 2cos(theta+fai+sai)=xyz+1/xyz
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if 2costheta=x+1/x , 2cos fai=y+1/y,2cossai=z+1/z then 2cos(theta+fai+sai)=xyz+1/xyz
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