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[cosec^(2)theta=(4xy)/((x+y)^(2))" is tr...

[cosec^(2)theta=(4xy)/((x+y)^(2))" is true if and only if "],[[" a) "x+y!=0," b) "x=y;x!=0," c) "x!=y," d) "x!=0;y!=0]]

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