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1. a2+1a2=2, a-1a =?

  • A. 3
  • B. 3
  • C. 3
  • D. 3

Answer: Option B

Explanation:

a^2 + 1/a^ = 2, a - 1/a

a^2 + b^2 = (a - b)^2 + 2ab

2 = (a - 1/a)^2 + 2a1/a

(a - 1/a)^2 = 2 - 2

a - 1/a = 0


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