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1) I have tried nearly all simplification methods, expansion, factorization, collect... on the following code for Ra1

var("x,a") Ra1 = -diff(x^a, x,2)/diff(x^a, x) show(Ra1)

but the self-evident simplification doesn't work. I wonder why. I also have tried to add assumption even I do not see why since it's only algebra

2) Is there a way to ask SM to factor on a variable ?

1) I have tried nearly all simplification methods, expansion, factorization, collect... on the following code for Ra1

var("x,a")
Ra1 = -diff(x^a, x,2)/diff(x^a, x)
show(Ra1)
show(Ra1)