1.问下列各函数有哪些孤立奇点?各属于哪一类型?如果是极点,指出它的阶数.-|||-(1) dfrac (1)({z)^3(({z)^2+1)}^2}-|||-(2) dfrac ({e)^2sin 2}({2)^2};-|||-(3) dfrac (1)({2)^3-(z)^2-z+1}-|||-(4) dfrac (1)(sin 2)-|||-(5) dfrac (z)((1+{z)^2)(1+(e)^z)}-|||-(6) sin dfrac (1)(1-z);-|||-(7) ^2-dfrac (1)(z);-|||-(8) sin dfrac (1)(z)+dfrac (1)({z)^2};-|||-overline (1-i)-|||-(10) dfrac ({z)^2n}(1+{z)^n};-|||-(11) dfrac (ln (z+1))(z);-|||-(12) dfrac ({e)^dfrac (1{1)-i}}({e)^2-1}