atan

Calculates the arc tangent of x, returning a value ranging from -π/2 to π/2.

Special Values
x	atan(x)	invalid?
±0.0	±0.0	no
±∞	NaN	yes

real atan(real x)
@safe pure nothrow @nogc
real
atan
(
real x
)
double atan(double x)
float atan(float x)

Examples

assert(isIdentical(atan(0.0), 0.0));
assert(atan(sqrt(3.0)).approxEqual(PI / 3));

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