यदि $2 \sin ^{-1} x-3 \cos ^{-1} x=4, x \in[-1,1]$ है,तो $2 \sin ^{-1} x+3 \cos ^{-1} x$ का मान ज्ञात कीजिए।

  • A
    $\frac{4-6 \pi}{5}$
  • B
    $\frac{6 \pi-4}{5}$
  • C
    $\frac{3 \pi}{2}$
  • D
    $0$

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यदि $\sin^{-1} x + \cos^{-1} y = \frac{2\pi}{5}$ है,तो $\cos^{-1} x + \sin^{-1} y$ का मान क्या होगा?

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