ans =
-1/2*(-a^2)^(1/2)/a^2*atanh(1/2*(2-8*(-a^2)^(1/2)*(x+(-a^2)^(1/2)))/(4*(x+(-a^2)^(1/2))^2-8*(-a^2)^(1/2)*(x+(-a^2)^(1/2))+1)^(1/2))+1/2*(-a^2)^(1/2)/a^2*atanh(1/2*(2+8*(-a^2)^(1/2)*(x-(-a^2)^(1/2)))/(4*(x-(-a^2)^(1/2))^2+8*(-a^2)^(1/2)*(x-(-a^2)^(1/2))+1)^(1/2))
这是我用MATLAB算的结果。
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