Bangtan Sonyeondan
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x - 1/x = 2
x² - 1 / x = 2
x² = 2x + 1
Putting the value of x² = 2x + 1 on x² + 1/x² , we get
2x + 1 + 1/2x+1
4x² + 4x + 2/ 2x +1
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