In some symbolic manipulations, I get a result which has something like abs(e)*sign(e). Why is this not simplified away, even by simplify? It's surely an identity that e = abs(e)*sign(e). For example, with this code:
syms xdiff(norm(diff(cos(x))))% ans = (abs(sin(t))*sign(sin(t))*cos(t))/(abs(sin(t))^2)^(1/2)
Best Answer