Trigonometric inverse cosine, element-wise.
| Parameters: | x – (array_like) x-coordinate on the unit circle. For real arguments, the domain is [-1, 1]. |
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| Returns: | (array_like) The inverse cosine of each element of x, in radians and in the closed interval [0, pi]. |
Examples:
>>> acos([1, -1])
array([0.0, 3.1415927])