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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If$\frac{{2x}}{{2{x^2} + 5x + 2}} > \frac{1}{{x + 1}}$, then

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