x-(1/x)=1 হলে x3-1/x3 এর মান কত?

A 1

B 3

C 4

D 9

Solution

Correct Answer: Option C

x3-1/x3=(x-1/x)3 + 3.x.1/x + (x-1/x)

= 13 + 3×1

= 1+3 = 4

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