Inverse sine, elementwise.
Parameters :  x : array_like
out : ndarray, optional


Returns :  angle : ndarray

Notes
arcsin is a multivalued function: for each x there are infinitely many numbers z such that . The convention is to return the angle z whose real part lies in [pi/2, pi/2].
For realvalued input data types, arcsin always returns real output. For each value that cannot be expressed as a real number or infinity, it yields nan and sets the invalid floating point error flag.
For complexvalued input, arcsin is a complex analytic function that has, by convention, the branch cuts [inf, 1] and [1, inf] and is continuous from above on the former and from below on the latter.
The inverse sine is also known as asin or sin^{1}.
References
Abramowitz, M. and Stegun, I. A., Handbook of Mathematical Functions, 10th printing, New York: Dover, 1964, pp. 79ff. http://www.math.sfu.ca/~cbm/aands/
Examples
>>> np.arcsin(1) # pi/2
1.5707963267948966
>>> np.arcsin(1) # pi/2
1.5707963267948966
>>> np.arcsin(0)
0.0