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Question: g(y) is simplify (f(y)), but f(10) is not equal g(10)

Question:g(y) is simplify (f(y)), but f(10) is not equal g(10)

assma 75
accuracy precision numeric floating-point
June 07 2018
0

f := proc (y) options operator, arrow; -(1-tanh(y-.25)^2)^2+2*tanh(y-.25)^2*(1-tanh(y-.25)^2) end proc;
g := proc (y) options operator, arrow; (2*cosh(y-.25)^2-3)/cosh(y-.25)^4 end proc;

f(10);
                                      -8
                        2.719999946 10  
g(10);
                                      -8
                        2.718614181 10  

g(y) is simplify (f(y)), but f(10) is not equal g(10), why?
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