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[sin^(2)12^(@)+sin^(2)21^(@)+sin^(2)39^(...

[sin^(2)12^(@)+sin^(2)21^(@)+sin^(2)39^(@)+sin^(2)48^(@)-sin^(2)9^(@)-],[sin^(2)18^(@)],[" is equal to "],[[" (1) Zero "," (2) "1],[" (3) "(3)/(2)," (4) "2]]

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