datatable.math.arccos()¶
Inverse trigonometric cosine of x
.
In mathematics, this may be written as \(\arccos x\) or \(\cos^{-1}x\).
The returned value is in the interval \([0, \frac12\tau]\),
and NA for the values of x
that lie outside the interval
[-1, 1]
. This function is the inverse of
cos()
in the sense that
cos(arccos(x)) == x
for all x
in the interval [-1, 1]
.
See also¶
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