The number of real roots of the polynomial equation $x^4-x^2+2 x-1=0$ is
The number of real roots of the polynomial equation $x^4-x^2+2 x-1=0$ is
- [KVPY 2018]
- A
$0$
- B
$2$
- C
$3$
- D
$4$
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- [KVPY 2015]
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