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[" 120) "sin^(2)theta=(4xy)/((x+y)^(2))"...

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

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