  For analytic functions f(z) in the open unit disk U with
f(0)=f'(0)-1=f"(0)=0, P. T. Mocanu (Mathematica (Cluj), 42(2000)) has
considered some sufficient arguments of f'(z)+zf"(z) for
|\arg(zf'(z)/f(z))|<\pi\mu/2. The object of the present paper is to discuss
those probrems for f(z) with f"(0)=f"'(0)=...=f^{(n)}(0)=0 and f^{(n+1)}(0) \ne
0.
