1.

If z_1, z_2 and z_3 be the vertices ofDelta ABC, taken in anti-clock wise direction and z_0 be the circumstance, then ((z_0 - z_1)/(z_0-z_2)) (sin2A)/(sin2B)+((z_0 - z_3)/(z_0 - z_2)) (sin 2 C)/(sin2 B) is equal to

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0
1
`-1`
2

Answer :C


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