Swift Tutorial Swift References

Swift - sin() Function



The Swift sin() function returns trigonometric sine of an angle (angle should be in radians). The return value will be in the range -1 through 1.

In the graph below, sin(x) vs x is plotted.

Sin Function

Syntax

In Foundation framework, it is defined as follows:

public func sin(_ x: CGFloat) -> CGFloat
public func sin(_ x: Float) -> Float
public func sin(_ x: Float80) -> Float80
public func sin(_ __x: Double) -> Double

Parameters

x Specify the angle in radian.

Return Value

Returns the trigonometric sine of an angle.

Example:

In the example below, sin() function is used to find out the trigonometric sine of an angle.

import Foundation

var pi = Double.pi

print("sin(pi/6) = \(sin(pi/6))")
print("sin(pi/4) = \(sin(pi/4))")
print("sin(pi/3) = \(sin(pi/3))")

The output of the above code will be:

sin(pi/6) = 0.49999999999999994
sin(pi/4) = 0.7071067811865475
sin(pi/3) = 0.8660254037844386

❮ Swift Math Functions

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