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Question: Why different between calculate two form?

Question:Why different between calculate two form?

assma 75 Maple 2017
accuracy roundoff evalf floating-point
April 25 2018
1

Why different between calculate two form? I use maple 2017

evalf(sech(20)^2); evalf(sech(-20)^2);
                                     
                       1.699341702 *10^ -17  
                                     
                       1.699341702 *10^ -17  
evalf(1-tanh(20)^2); evalf(1-tanh(-20)^2);
                               0.
                               0.

 
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