acos

Calculates the arc cosine of x, returning a value ranging from 0 to π.

Special Values
x	acos(x)	invalid?
>1.0	NaN	yes
<-1.0	NaN	yes
NaN	NaN	yes

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

Examples

assert(acos(0.0).approxEqual(1.570));
assert(acos(0.5).approxEqual(std.math.PI / 3));
assert(acos(PI).isNaN);

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