यदि $2 \sin^{-1} x - 3 \cos^{-1} x = 4$ है, तो $2 \sin^{-1} x + 3 \cos^{-1} x =$ का मान क्या होगा?

  • A
    $\frac{6\pi - 4}{5}$
  • B
    $\frac{6\pi + 4}{5}$
  • C
    $\frac{5\pi - 4}{6}$
  • D
    $\frac{5\pi + 4}{6}$

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