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Mathematics
Mathematics
Problem
For any integer
k
k
k
, the angle
−
90
∘
+
360
∘
k
-90^{\circ}+360^{\circ}k
−
9
0
∘
+
36
0
∘
k
has its terminal side along the a) positive
y
y
y
-axis b) negative
x
x
x
-axis c) positive
x
x
x
-axis d) negative
y
y
y
-axis
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