∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,

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∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,如图,∞∑n=

∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,
∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,

∞∑n=1,x^(4n+1)/(4n+1),求幂级数的和函数,
如图,

∞∑n=1,x^(4n+1)/(4n+1)
=∞∑n=1,∫x^(4n)dx(积分区间0到x,下同)
=∫[∞∑n=1,x^(4n)]dx
=∫x^4/(1-x^4)dx
=-∫dx+1/2∫1/(1-x²)dx+1/2∫1/(1+x²)dx
=-x+1/4ln|(1+x)/(1-x)|+1/2arctanx

先求微分,然后再求和 ,最后再积回去