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IF the equation ax^2 + 2bx + 3c =0 an...

IF the equation `ax^2 + 2bx + 3c =0 and 3x^(2)+8x+15=0` have a common root , where a,b,c are the length of the sides of a ` Delta ABC ` , then ` sin ^2 A + sin ^2 B+ sin ^(2)`C=

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