यदि $x=\sin \theta$ और $y=\sin(k \theta)$ है, तो $(1-x^2) y_2-x y_1-\alpha y=0$ के लिए $\alpha=$

  • A
    $k$
  • B
    $-k$
  • C
    $-k^2$
  • D
    $k^2$

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