SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Use this function to compute arc cosine of x.


double SDL_acos(double x);

Function Parameters

x floating point value, in radians.

Return Value

Returns arc cosine of x.


The definition of y = acos(x) is x = cos(y).

Domain: -1 <= x <= 1

Range: 0 <= y <= Pi


This function is available since SDL 2.0.2.


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