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

[(8.)sec^(2)theta=(4xy)/((x+y)^(2))" is true if and only if "],[[" (a) "x+y!=0," (B) "x=y,x!=0],[" (6) "x=y," (D) "x!=0,y!=0]]

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