求解一道不定积分题

-1/(7a^3)(2ArcTan[Cot[π/7]+(xCsc[π/7])/a]Cos[π/14]-2ArcTan[(xSec[π/14])/a+Tan[π/14]]Cos[(3π)/14]+Log[a-x]-Cos[π/7]Log[a^2+x^2-2axSin[(3π)/14]]-Log[a^2+x^2+2axCos[π/7]]Sin[π/14]+2ArcTan[(xSec[(3π)/14])/a-Tan[(3π)/14]]Sin[π/7]+Log[a^2+x^2+2axSin[π/14]]Sin[(3π)/14])
或
-(2ArcTan[((x+aCos[π/7])Csc[π/7])/a]Cos[π/14])/(7a^3)+(2ArcTan[(Sec[π/14](x+aSin[π/14]))/a]Cos[(3π)/14])/(7a^3)-Log[a-x]/(7a^3)+(Cos[π/7]Log[a^2+x^2-2axSin[(3π)/14]])/(7a^3)+(Log[a^2+x^2+2axCos[π/7]]Sin[π/14])/(7a^3)-(2ArcTan[(Sec[(3π)/14](x-aSin[(3π)/14]))/a]Sin[π/7])/(7a^3)-(Log[a^2+x^2+2axSin[π/14]]Sin[(3π)/14])/(7a^3)

隔三米开外去看楼上的答案，绝对以为是蝌蚪文。

O(∩_∩)O

题目不完整,是对X求不定积分还是A,谁是积分变量要确定