Use this function to compute arc cosine of `x`

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`double SDL_acos(double x);`

x |
floating point value, in radians. |

Returns arc cosine of `x`

.

The definition of `y = acos(x)`

is `x = cos(y)`

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Domain: `-1 <= x <= 1`

Range: `0 <= y <= Pi`

This function is available since SDL 2.0.2.

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