Quantitative Aptitude Algebra Identities

If x4 + x2y2 + y4 = \(\frac{21}{256}\) and x2 - xy + y2 = \(\frac{7}{16}\) then the value of xy is:

1
\(-\frac{1}{4}\)
2
\(\frac{1}{4}\)
3
\(-\frac{1}{8}\)
4
\(\frac{1}{8}\)

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