? simplyfiy. pls. help
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1 /4x sq. - 1/4xy + 1/16y sq.
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{(1/2x)- (1/4y)}^2
= (1/4x^2)+(1/16y^2)-(1/4xy)
[Hint:(a-b)^2=a^2+b^2-2ab]
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