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JavaScript Math Functions

Math.sin()

Usage:

Math.sin(angle)

Math.sin(0)            // 0
Math.sin(1)            // 0.8414709848078965
Math.sin(Math.PI / 2)  // 1
Math.sin(2)            // 0.9092974268256817
Math.sin(Math.PI)      // 0
Math.sin(4)            // -0.7568024953079282

Parameters:

  • angle: an angle measured in radians

Returns:

  • The sine of angle

Description:

Math.sin(angle) calculates the sine of an angle: a number between -1 and 1 representing the ratio of the vertical side of a right triangle at that angle to the hypotenuse of that right triangle.

The sine function oscillates from -1 to 1 in a wave, and is useful to use to calculate the position of something that is oscillating, like a weight on a soft spring, or a swinging game obstacle.

Wikipedia has more information on sine, and MDN has more information on Math.sin

Math.cos()

Usage:

Math.cos(angle)

Math.cos(0)            // 1
Math.cos(1)            // 0.5403023058681398
Math.cos(Math.PI / 2)  // 0
Math.cos(2)            // -0.4161468365471424
Math.cos(Math.PI)      // -1
Math.cos(4)            // -0.6536436208636119

Parameters:

  • angle: an angle measured in radians

Returns:

  • The cosine of angle

Description:

Math.cos(angle) calculates the cosine of an angle: a number between -1 and 1 representing the ratio of the horizontal side of a right triangle at that angle to the hypotenuse of that right triangle.

The cosine function oscillates from 1 to 0 to -1 and back in a wave, and is useful to use to calculate the position of something that is oscillating, like a weight on a soft spring, or a swinging game obstacle.

Wikipedia has more information on cosine, and MDN has more information on Math.cos