수식 2: "y" equals Start sum from "n" equals 0 to "a" , end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, left parenthesis, "n" , right parenthesis , Baseline "x" Superscript, 2 "n" , Baseline Over left parenthesis, 2 "n" , right parenthesis ! , EndFraction 그래프가 존재합니다. 오디오 추적을 활성화하려면 Alt+T 를 누르세요.y=a∑n=0−1nx2n2n!