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}