a - (1/a) = 4, হলে a3 - (1/a3) = কত?
Solution
Correct Answer: Option B
দেওয়া আছে a - (1/a) = 4
এখানে a3 - (1/a3)
= a3 - (1/a)3
= {a - (1/a)}3 + 3.a.(1/a) {a - (1/a)}
= 43 + 3 × 4
= 64 + 12
= 76
এখানে a3 - (1/a3)
= a3 - (1/a)3
= {a - (1/a)}3 + 3.a.(1/a) {a - (1/a)}
= 43 + 3 × 4
= 64 + 12
= 76
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