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

[sin^(2)theta=((x+y)^(2))/(4xy)," where "x,y in R," gives real "theta" if and only if "],[[" (A) "x+y=0," (b) "x=y],[" (C) "|x|=|y|!=0," (D) none of these "]]

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