float acos ( float  x )

inline

Compute arc cosine.

Computes the principal value of the arc cosine of x, expressed in radians. In trigonometrics, arc cosine is the inverse operation of cosine.

Parameters

x	Floating point value in the interval [-1,+1].

Returns

Arc cosine of x, in the interval [0,pi] radians.

Warning

This function requires the enhanced NBC/NXC firmware.

Examples:

ex_acos.nxc.