$\triangle ABC$ में,यदि $\angle A = 90^{\circ}$ है,तो $\cos^{-1}\left(\frac{R}{r_2+r_3}\right)$ का मान क्या होगा ($^{\circ}$ में)?

  • A
    $90$
  • B
    $30$
  • C
    $60$
  • D
    $45$

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