Unit circle pi
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cos pi
-1
sin 3pi/2
-1
cos 3pi/2
0
cos pi/2
0
sin 0
0
sin pi
0
tan 0
0
tan pi
0
cos 0
1
sin pi/2
1
tan 3pi/2
und.
tan pi/2
und.
cos pi
-1
sin 3pi/2
-1
cos 3pi/2
0
cos pi/2
0
sin 0
0
sin pi
0
tan 0
0
tan pi
0
cos 0
1
sin pi/2
1
tan 3pi/2
und.
tan pi/2
und.
