求lim e^(1/x^2)*arctan((x^2+2-1)/(x+1)*(x-2))當x趨近於0,-1,2的值

求lim e^(1/x^2)*arctan((x^2+2-1)/(x+1)*(x-2))當x趨近於0,-1,2的值

是不是那兒錯了少了個X