NXC  Version 1.2.1 r5
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This is an example of how to use the acosd function.

// ex_acosd.nxc
// Display values of the acosd API call.
// This program runs indefinitely -- press gray button to exit.
// Reguires enhanced firmware 1.28 or later.
#define MIN_VAL -1.0
#define MID_VAL 0.0
#define MAX_VAL 1.0
#define INVALID 2.0
inline void show_acos(const float val, const int screen_y)
TextOut(0, screen_y, FormatNum("%6.2f DEG", acosd(val)));
task main()
show_acos(MIN_VAL, LCD_LINE1); // shows 180.00 DEG
show_acos(MID_VAL, LCD_LINE2); // shows 90.00 DEG
show_acos(MAX_VAL, LCD_LINE3); // shows 0.00 DEG
// An invalid value returns not-a-number (nan).
show_acos(INVALID, LCD_LINE4); // shows -nan DEG
while (true);