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Q:

यदि $$ {x^{4}+x^{2}y^{2}+y^{4}={21\over256}}$$ और $$ {x^{2}+xy+y^{2}={3\over16}}$$ है तो तब $$ {2(x^{2}+y^{2})}=?$$ होगा।

  • 1
    $$ {3\over 8}$$
  • 2
    $$ {5\over 8}$$
  • 3
    $$ {3\over 4}$$
  • 4
    $$ {5\over 16 }$$
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Answer : 2. "$$ {5\over 8}$$"

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