a+1/a=2 হলে a3+1/a3এর মান কত?
Solution
Correct Answer: Option B
দেওয়া আছে, a+(1/a) = 2
∴a3+(1/a3 )= (a+ 1/a)3 -3.a.1/a (a+ 1/a)
= 23 - 3. 2
= 8 - 6
= 2
∴a3+(1/a3 )= (a+ 1/a)3 -3.a.1/a (a+ 1/a)
= 23 - 3. 2
= 8 - 6
= 2
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