x − 1/x = 1 হলে x3 − 1/x3 এর মান কত?

A 6

B 4

C 8

D 2

Solution

Correct Answer: Option B

x3 − 1/x3
=(x-1/x)³+3.x.1/x(x-1/x)
=(1)³+3.1
=1+3
=4

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