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Question: How to simplify the trigonometric expression

Question:How to simplify the trigonometric expression

Kitonum 20534 Maple 2018
January 11 2021
2

How to simplify this trigonometric expression with Maple? I only know the way with  identify command, which is difficult to call mathematically correct:

restart;
Expr:=arctan((1-tan(20*Pi/180))/(1-tan(25*Pi/180)));
evalf[15](Expr);
identify(%);

                           

        

 
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