SSC Delhi Police MTS (Civilian) Mock Test Series Quantitative Aptitude Algebra Identities

यदि x4 + x2y2 + y4 = \(\frac{21}{256}\) और x2 - xy + y2 = \(\frac{7}{16}\) है, तो xy का मान क्या होगा?

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