यदि $\tan ^{2} \theta = \sin ^{2} \theta + \cos ^{2} \theta$ और $0 < \theta < 90^{\circ}$ है,तो $\theta$ का मान ...... है। ($^{\circ}$ में)

  • A
    $30$
  • B
    $45$
  • C
    $60$
  • D
    $75$

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