sin/cos/tan unit circle
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tan(3pi/4)
-1
cos(2pi/3)
-1/2
cos(3pi/4)
-sqrt2/2
tan(2pi/3)
-sqrt3
cos(5pi/6)
-sqrt3/2
tan(5pi/6)
-sqrt3/3
cos(pi/2)
0
sin(pi)
0
tan(pi)
0
sin(pi/2)
1
tanpi/4
1
cos(pi/3)
1/2
sin(5pi/6)
1/2
sin(pi/6)
1/2
cos(pi/4)
sqrt2/2
sin(3pi/4)
sqrt2/2
sin(pi/4)
sqrt2/2
tan(pi/3)
sqrt3
cos(pi/6)
sqrt3/2
sin(2pi/3)
sqrt3/2
sin(pi/3)
sqrt3/2
tan(pi/6)
sqrt3/3
tan(pi/2)
und.
cos(pi)
-1