math.h Arcusy funkcji trygonometrycznych double acos (double x); float acosf (float x); long double acosl (long double x); double asin (double x); float asinf (float x); long double asinl (long double x); double atan (double x); float atanf (float x); long double atanl (long double x); double atan2 (double a, double b); float atan2f(float a, double b); long double atan2l(long double a, double b);
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