x-1/x =1 হলে x³-1/x³ এর মান কত?

A 1

B 2

C 3

D 4

Solution

Correct Answer: Option D

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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