AP EAMCET Engineering 2016 Code C Paper

Section: Mathematics
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Question : 80 of 160
 
Marks: +1, -0
In ΔABC, if x=tan(
BC
2
)
tan
A
2
,y=tan(
CA
2
)
tan
B
2
and z=tan(
AB
2
)
tan
C
2
then (x+y+z)=
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