Python cos function
Python cos(x) function returns the cosine value of x.
The principle values for x is [-∞,∞]. It's a method of math module.
>>> import math
>>> math.cos(math.pi)
-1.0
>>> math.cos(0)
1
>>> math.cos(3 * math.pi/4)
-0.7071067811865475
>>> math.cos(math.pi/3)
-0.5000000000000001
y=cosine(x) Graph
X
(deg)
| X
(Rad)
| Y=cosine(X)
|
| 180 ̊
| π
| -1
|
| 150 ̊
| 5π/6
| -0.866025
|
| 135 ̊
| 3π/4
| -0.707107
|
| 120 ̊
| 2π/3
| -0.5
|
| 90 ̊
| π/2
| 0
|
| 60 ̊
| π/3
| 0.5
|
| 45 ̊
| π/4
| 0.707107
|
| 30 ̊
| π/6
| 0.866025
|
| 0 ̊
| 0
| 1
|
Cosine Functions
1. cos(-x) = cos(x);
2. sine2(x) + cos2(x) = 1
The principle values for x is (-∞,∞).
