α
0
{\displaystyle \scriptstyle 0}
π
6
{\displaystyle \textstyle {\frac {\pi }{6}}}
π
4
{\displaystyle \textstyle {\frac {\pi }{4}}}
π
3
{\displaystyle \textstyle {\frac {\pi }{3}}}
π
2
{\displaystyle \textstyle {\frac {\pi }{2}}}
2
π
3
{\displaystyle \textstyle {\frac {2\pi }{3}}}
3
π
4
{\displaystyle \textstyle {\frac {3\pi }{4}}}
5
π
6
{\displaystyle \textstyle {\frac {5\pi }{6}}}
π
{\displaystyle \scriptstyle \pi }
cos α
1
{\displaystyle \scriptstyle 1}
3
2
{\displaystyle \textstyle {\frac {\sqrt {3}}{2}}}
2
2
{\displaystyle \textstyle {\frac {\sqrt {2}}{2}}}
1
2
{\displaystyle \textstyle {\frac {1}{2}}}
0
{\displaystyle \scriptstyle 0}
−
1
2
{\displaystyle \scriptstyle -\textstyle {\frac {1}{2}}}
−
2
2
{\displaystyle \scriptstyle -\textstyle {\frac {\sqrt {2}}{2}}}
−
3
2
{\displaystyle \scriptstyle -\textstyle {\frac {\sqrt {3}}{2}}}
−
1
{\displaystyle \scriptstyle -1}
α
0
{\displaystyle \scriptstyle 0}
−
π
6
{\displaystyle \scriptstyle -\textstyle {\frac {\pi }{6}}}
−
π
4
{\displaystyle \scriptstyle -\textstyle {\frac {\pi }{4}}}
−
π
3
{\displaystyle \scriptstyle -\textstyle {\frac {\pi }{3}}}
−
π
2
{\displaystyle \scriptstyle -\textstyle {\frac {\pi }{2}}}
−
2
π
3
{\displaystyle \scriptstyle -\textstyle {\frac {2\pi }{3}}}
−
3
π
4
{\displaystyle \scriptstyle -\textstyle {\frac {3\pi }{4}}}
−
5
π
6
{\displaystyle \scriptstyle -\textstyle {\frac {5\pi }{6}}}
−
π
{\displaystyle \scriptstyle -\pi }
cos α
1
{\displaystyle \scriptstyle 1}
3
2
{\displaystyle \textstyle {\frac {\sqrt {3}}{2}}}
2
2
{\displaystyle \textstyle {\frac {\sqrt {2}}{2}}}
1
2
{\displaystyle \textstyle {\frac {1}{2}}}
0
{\displaystyle \scriptstyle 0}
−
1
2
{\displaystyle \scriptstyle -\textstyle {\frac {1}{2}}}
−
2
2
{\displaystyle \scriptstyle -\textstyle {\frac {\sqrt {2}}{2}}}
−
3
2
{\displaystyle \scriptstyle -\textstyle {\frac {\sqrt {3}}{2}}}
−
1
{\displaystyle \scriptstyle -1}