જો $x = \tan^{-1} \left(\frac{1}{5}\right) + \tan^{-1} \left(\frac{1}{8}\right)$ હોય, તો $\frac{\sin x + \cos x}{\tan x} = $

  • A
    $\frac{12}{\sqrt{10}}$
  • B
    $\frac{15}{\sqrt{10}}$
  • C
    $\frac{1}{\sqrt{10}}$
  • D
    $\frac{6 \sqrt{2}}{\sqrt{10}}$

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