যদি √x + 1/√x = a হয়, তবে x2 + 1/x2 এর মান কত?
a4 - 2a2 + 2
a4 + 4a2 + 2
a4 - 4a2 - 2
a4 - 4a2 + 2
x + 1/x = a হলে, x3 + 1/x3 = কত?
a - 3
a3 - 3a
a3 + 3a
a + 3
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