[" If in a "Delta ABC,[[1,a,b],[1,c,a],[...

[" If in a "Delta ABC,[[1,a,b],[1,c,a],[1,b,c]|=0," then the value of "sin^(2)A+sin^(2)B+sin^(2)C" is "],[[" (a) "(9)/(4)," (b) "(4)/(9)],[" (c) "(3sqrt(3))/(2)," (d) "1]]

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