Question: Error in Plot complicated functions

I'm trying to plot a function but I recieved the error :

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct.

It seems its simply because the function is a bit complicated, because I get the correct plot with eaither part of the function separated. Its my function:

 

 

The plot produce no error when I separate it to

and

please help me on this!

 

 



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