$\left[\sin \left(\tan ^{-1} \frac{3}{4}\right)\right]^{2}+\left[\sin \left(\tan ^{-1} \frac{4}{3}\right)\right]^{2}=$

  • A
    $5$
  • B
    $1$
  • C
    $-1$
  • D
    $0$

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