x – 1/x =1 হলে x3 – 1/x3 এর মান কত?
Solution
Correct Answer: Option B
এখানে, x – 1/x =1
x³ – 1/x³
= (x – 1/x)³+3.x.1/x(x – 1/x)
= 1³+3.1
= 1+3
= 4
x³ – 1/x³
= (x – 1/x)³+3.x.1/x(x – 1/x)
= 1³+3.1
= 1+3
= 4
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