Партнёры:
Хостинг:
atan, atanf, atanl - arc tangent function
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double atan(double x);
float atanf(float x);
long double atanl(long double x);
These functions compute the principal value of the arc tangent of x.
Upon successful completion, these functions return the arc tangent of x in the range [-pi /2,pi /2] radians.
If x is NaN, NaN is returned.
If x is ±0, x is returned.
If x is ±Inf, ±pi /2 is returned.
See attributes(5) for descriptions of the following attributes:
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atan2(3M), isnan(3M), math.h(3HEAD), tan(3M), attributes(5), standards(5)
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