প্রশ্নঃ
x + 1/x = a হলে, x3 + 1/x3 = কত?
-
ক.
a - 3
-
খ.
a3 - 3a
-
গ.
a3 + 3a
-
ঘ.
a + 3
উত্তরঃ উত্তর পাওয়া যায় নাই।
 a - 3 খ) a3 - 3a গ) a3 + 3a ঘ) a + 3 উত্তর: খ) a3 - 3a
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