dask/ python invalid value encountered in arccos

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I am quite new to python and was tring to use dask but I keep getting RuntimeWarning and dont really get why. Some insight would be nice.

code:

x2 = da.random.uniform(0.01,0.1,size=1e6,chunks= 1e5)
%time asd2 = da.arccos(x2)

this constantly gives me:

C:\ProgramsPhD\Anaconda\lib\site-packages\dask\array\core.py:457: RuntimeWarning: invalid value encountered in arccos o = func(*args, **kwargs)

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