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1.  − 1 x = 1 , x 3 − 1 x 3 = ?

  • A. 1
  • B. 1
  • C. 1
  • D. 1

Answer: Option D

Explanation:

 দেয়া আছে, 
x−1/x=1
x^3−1/x^3
=(x−1/x)^3+3.x.1/x(x−1/x)
=(1)3 +3.1
=4
 

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