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[" 4"],[" The equation "cos^(2)theta=((x...

[" 4"],[" The equation "cos^(2)theta=((x+y)^(2))/(4xy)" is "],[" only possible when "],[" What "cos^(2)theta=((x+y)^(2))/(4xy)" aft "pi4a(1)/(2)" are "],[[" (a) "x=-y," (b) "x>y],[" (c) "x=y," (d) "x

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