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Q:

यदि $$x^4+{16\over x^4}=15617, x>0$$  है तो $$x+{2\over x}$$ का मान ज्ञात कीजिए 

  • 1
    $$ \sqrt {121} $$
  • 2
    $$ \sqrt {127} $$
  • 3
    $$ \sqrt {129} $$
  • 4
    $$ \sqrt {123} $$
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Answer : 3. "$$ \sqrt {129} $$"

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