syms x y a
y=1/((1/12)*x^4-(1/12)*a^4-x^2+a^2)^5
int(y,x,a,0)
y =
1/(1/12*x^4-1/12*a^4-x^2+a^2)^5
ans =
1/signum(a)^5/signum(a^2-6)^5*Inf
matlab计算，signum即sign函数，取符号，正1.负-1.0
y=1/((1/12)*x^4-(1/12)*a^4-x^2+a^2)^5
int(y,x,a,0)
y =
1/(1/12*x^4-1/12*a^4-x^2+a^2)^5
ans =
1/signum(a)^5/signum(a^2-6)^5*Inf
matlab计算，signum即sign函数，取符号，正1.负-1.0
