x - (1/x) = 1 হলে x³ - (1/x³) এর মান কত?  

A 4.0 

B 1.0 

C 2.0 

D 3.0

Solution

Correct Answer: Option A

দেওয়া আছে,
         x - 1/x = 1

আমরা জানি,
x3 - 1/x3 = (x - 1/x)3 + 3.x.1/x(x - 1/x)
              = 13 + 3 × 1
              = 1 + 3
              = 4

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