About numpy array in attaching the where doubts when using generic function-CodePudding

Is shown in the following example, array b ascribed value with additional where generic function can get the correct result, but not in universal function assignment directly using array and the where will produce an error results. Please explain what, thank you.

 
The import numpy as np 
B=np. Array ((... 0, 30, 45, 60, 90.)) * np in PI/180 
Print (b) 
Print () 
Print (np. Sin (b, where=[True, False, True, False, True))) 
Print () 
Print (np) sin (np) array ((... 0, 30, 45, 60, 90.)) * np in PI/180, where=[True, False, True, False, True))) 

# out: 
[0. 0.52359878 0.78539816 1.04719755 1.57079633] 

[0. 0.52359878 0.70710678 1.04719755 1] 

[0. 94.24777961 0.70710678 188.49555922 1]