x4- x2+ 1 = 0 হলে ,x2 - 1/x2 = কত?
A
14
B
1
C
√5
D
3
Correct Answer: 1
x4 - x2 + 1 = 0= > x4 + 1 = x2= > x2 + 1/x2 = 1 [x2 দ্বারা ভাগ করে]