यदि $\sin 21^{\circ} = \frac{x}{y}$ है,तो $\sec 21^{\circ} - \sin 69^{\circ}$ का मान ज्ञात कीजिए।

  • A
    $\frac{x^{2}}{y \sqrt{y^{2}-x^{2}}}$
  • B
    $\frac{y^{2}}{x \sqrt{y^{2}-x^{2}}}$
  • C
    $\frac{x^{2}}{y \sqrt{x^{2}-y^{2}}}$
  • D
    $\frac{y^{2}}{x \sqrt{x^{2}-y^{2}}}$

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यदि $x \sin 45^\circ \cos^2 60^\circ = \frac{\tan^2 60^\circ \csc 30^\circ}{\sec 45^\circ \cot^2 30^\circ}$ है,तो $x = $

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