$\frac{\cos (90^{\circ}- A ) \sin (90^{\circ}- A )}{\tan (90^{\circ}- A )}$ का सरलीकरण ....... है।

  • A
    $\sin ^{2} A$
  • B
    $\cos ^{2} A$
  • C
    $\sin A$
  • D
    $1$

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