Published Oct 17, 2023
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The sin() function in Lua’s math library calculates the sine of an angle given in radians. The result is the ratio of two sides of a right-angled triangle: the length of the side opposite the given angle to the length of the hypotenuse.


  • angle: The angle in radians.


In this example, math.sin() calculates the sine of a 90 degree angle (π/2 radians).

local angle = math.pi / 2
local answer = math.sin(angle)
local output = string.format("The sine of %.4f is approximately %.0f", angle, answer)

This is the resulting output:

The sine of 1.5708 is approximately 1

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