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420

Q:

यदि x4+y4+x2y2=21 तथा x2+y2-xy=7 है, तो $${x\over y}+{y\over x}$$ का मान क्या है?

  • 1
    $$15\over 8$$
  • 2
    $$3\over 2$$
  • 3
    $$27\over 28$$
  • 4
    $$3\over 4$$
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Answer : 2. "$$3\over 2$$"

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