જો $\cos (\alpha+\beta)=0$ હોય,તો $\sin (\alpha-\beta)$ ને શેમાં ઘટાડી શકાય?

  • A
    $\cos 2 \beta$
  • B
    $\cos \beta$
  • C
    $\sin \alpha$
  • D
    $\sin 2 \alpha$

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