a+1/a = 3 হলে a4 + (1/a)4 = কত?
Solution
Correct Answer: Option B
a4 + (1/a)4
=(a2)2-(1/a2)2
=(a2+1/a2)2-2a2.1/a2
={(a+1/a)2-2a.1/a}-2 =(32-2)2-2
=49-2=47
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