$\triangle ABC$ में,यदि $a: b: c = 3: 5: 7$ है,तो $\cos A + \cos B =$

  • A
    $\frac{13}{7}$
  • B
    $\frac{11}{7}$
  • C
    $\frac{12}{7}$
  • D
    $\frac{10}{7}$

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