The sines of the angles ?1 and ?2 are equal, respectively to?

1. sin ?1 =(AC/CD) sin ?2=(BD/AB)
2. sin?1=(BD/AD) sin?2=(AC/AD)
3. sin ?1=(AB/AD) sin ?2=(CD/AD)
4. sin ?1=(AB/CD) sin ?2=(BD/AC)
5. sin ?1=(AC/AD) sin ?2=(BD/AD)
6. sin ?1=(BD/CD) sin ?2=(AC/AB)
7. sin ?1=(BD/AB) sin ?2=(AC/CD)
8. sin ?1=(CD/AD) sin ?2=(AB/DA)

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