Hàm sơ cấp Hàm hợp (x a )’= ax a-1 (1/x)’=-1/x 2 (Căn(x))’=1/2 căn (x) (u a )’=a.u a-1 .u’ (1/u)’=-1u’/u 2 (Căn(u))’=u’/2 căn (u) (e x )’=e x a x =a x lna (e u )’=e u u’ a u =a u lna.u’ (ln/x/)’=1/x (ln/u/)’=u’/u (Loga/x/)’=1/xlna (Loga/u/)’=u’/ulna