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acos

mipylib.numeric.minum.acos(x)

Trigonometric inverse cosine, element-wise.

Parameters:x – (array_like) x-coordinate on the unit circle. For real arguments, the domain is [-1, 1].
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])