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[" 7."sin theta+sin phi,=a,cos theta+cos...

[" 7."sin theta+sin phi,=a,cos theta+cos phi=b*bar(2)(a|" sialt "sqrt(cos1)R_(x)],[tan(theta-phi)/(2),=+-sqrt((4-a^(2)-b^(2))/(a^(2)+b^(2)))]

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