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Q:

If $$ {x+{1\over x}}=3$$ then find the value of $$ {x^2}-{1\over {x^2}}$$:

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

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