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     x, a =SR.var('x a')
    Uf1= x^a
    ar1_x=diff(Uf1, x).full_simplify()
    ar1_xx=diff(Uf1, x,2)
    raar1 = -diff(Uf1, x,2)/diff(Uf1, x).full_simplify()
    show(LatexExpr("U^{'}(x) ="+latex(ar1_x)))
    show(LatexExpr("U^{''}(x) ="+latex(ar1_xx)))
    show(LatexExpr("R_a(x) ="+latex(raar1)))

Why raar1 is not fully simplified ?