यदि $\theta$ और $\phi$ प्रथम चतुर्थांश ($1^{st}$ quadrant) में ऐसे कोण हैं कि $\tan \theta = 1/7$ और $\sin \phi = 1/\sqrt{10}$ है,तो:

  • A
    $\theta + 2\phi = 90^\circ$
  • B
    $\theta + 2\phi = 60^\circ$
  • C
    $\theta + 2\phi = 30^\circ$
  • D
    $\theta + 2\phi = 45^\circ$

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