Fixed point inverse cosine lookup table.


This function finds the inverse cosine of a value using a lookup table. The input value must be a fixed point radian. The inverse cosine is defined only in the domain from `-1' to `1'. Outside of this input range, the function will set `errno' to EDOM and return zero. Example:
      fixed result;

/* Sets `result' to binary angle 128. */ result = fixacos(itofix(-1));
Returns the inverse sine of a fixed point value, measured as fixed point binary format angle, or zero if the input was out of range. All return values of this function will be in the range `0' to `128'.
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