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Solution
Expression : $$x - \frac{1}{x} = 3$$
Squaring both sides, we get :
=> $$x^2 + \frac{1}{x^2} - 2.x.\frac{1}{x} = 9$$
=> $$x^2 + \frac{1}{x^2} - 2 = 9$$
=> $$x^2 + \frac{1}{x^2} = 9 + 2 = 11$$
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