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Question: How do i solve a diff problem with arctan. when arctan=Pi/2

Question:How do i solve a diff problem with arctan. when arctan=Pi/2

Rookieplayer 25 Maple
diff piecewise undefined
April 27 2021
1

As the title, who can help me fix the problem like this

theta:= diff(arctan(y,x)):

W:= piecewise(

         theta>-Pi/2 and theta< -Pi/2+10, 1+A+B*cos(theta),

         theta>-Pi/2+10 and theta< Pi/2-10. 1-A+B*cos(thea)); 

there always plotout the undefined when acrtan(y,x)=Pi/2,

How can I ignore this undefined or define another value for W when acrtan(y,x)=Pi/2
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