ee.Number.cos

Page Summary

• The Number.cos() method computes the cosine of a number assumed to be in radians.

• It takes a single numerical input and returns a numerical output.

• Examples demonstrate calculating the cosine of various angles in both JavaScript and Python.

Computes the cosine of the input in radians.

Usage	Returns
Number.cos()	Number

Argument	Type	Details
this: input	Number	The input value.

Examples

Code Editor (JavaScript)

// Input angle in radians.
print('Cosine of 0', ee.Number(0).cos());  // 1
print('Cosine of π/2', ee.Number(Math.PI/2).cos());  // 0 (nearly)
print('Cosine of π', ee.Number(Math.PI).cos());  // -1

// Convert degrees to radians.
var degrees = 45;
var radians = degrees * (Math.PI/180);
print('Cosine of 45 degrees', ee.Number(radians).cos());  // 0.707106781

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

import ee
import geemap.core as geemap

Colab (Python)

import math

# Input angle in radians.
display('Cosine of 0:', ee.Number(0).cos())  # 1
display('Cosine of π/2:', ee.Number(math.pi/2).cos())  # 0 (nearly)
display('Cosine of π:', ee.Number(math.pi).cos())  # -1

# Convert degrees to radians.
degrees = 45
radians = degrees * (math.pi/180)
# 0.707106781
display('Cosine of 45 degrees:', ee.Number(radians).cos())