જો $\sec x + \tan x = 3, x \in (0, \frac{\pi}{2})$ હોય,તો $\sin x =$

  • A
    $\frac{3}{5}$
  • B
    $\frac{4}{5}$
  • C
    $-1$
  • D
    $\frac{1}{5}$

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