Trigonometry Angles--Pi
TrigonometryAnglesPi
By the definition of the functions of trigonometry, the sine of pi is equal to the y-coordinate of the point with polar coordinates (r,theta)=(1,pi), giving sinpi=0. Similarly, cospi=-1, since it is the x-coordinate of this point. Filling out the other trigonometric functions then gives
cospi = -1
(1)
cotpi = infty
(2)
cscpi = infty
(3)
secpi = -1
(4)
sinpi =
(5)
tanpi = 0.
(6)
See also
Trigonometry Angles, TrigonometryExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Trigonometry Angles--Pi." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/TrigonometryAnglesPi.html