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[" 6.If "A,B,C" are the angles of a tria...

[" 6.If "A,B,C" are the angles of a triangle,then the determinum "],[qquad [Delta=|sin2A sin C,sin B],[sin C,sin2B,sin A],[sin B,sin A,sin2C]|" is equal to "],[[" (a) "1," (b) "-1],[" (c) "sin A+sin B+sin C," (d) none of these "]]

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