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UPSC NDA II 2011 Mathematics Paper
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© examsnet.com
Question : 3
Total: 120
If
x
=
y
cos
(
2
π
3
)
=
z
cos
(
4
π
3
)
, then what is
x
y
+
y
z
+
z
x
equal to?
−
1
0
1
2
Validate
Solution:
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