যদি a + 1/a = 4 হয়, তাহলে a2 + 1/a2 = কত?
Solution
Correct Answer: Option B
দেয়া আছে, a + 1/a = 4
a2+1/a2= (a + 1/a)2 – 2 a.1/a
= (4)2 - 2
= 16 – 2
= 14
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