1.

In Delta ABC , if x=tan((B-C)/(2))tan.(A)/(2),y=tan((C-A)/(2))tan.(B)/(2) and z=tan((A-B)/(2))tan.(C)/(2) then (x+y+z)=.

Answer»

`-2XYZ`
`2xyz`
`XYZ`
`-xyz`

ANSWER :D


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