∫dx/(x+1)^4/3*(x-1)^2/3=∫[(x-1)/(x+1)]^1/3*dx/(x^2-1),这一步怎么解出来的?还有∫xdx/[4-x^2+(4-x^2)^1/2]=∫[1/(4-x^2)^1/2+1]*xdx/(4-x^2)^1/2,这一步怎么解出来的,

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∫dx/(x+1)^4/3*(x-1)^2/3=∫[(x-1)/(x+1)]^1/3*dx/(x^2-1),这一步怎么解出来的?还有∫xdx/[4-x^2+(4-x^2)^1/2]=∫[1/(4-x^

∫dx/(x+1)^4/3*(x-1)^2/3=∫[(x-1)/(x+1)]^1/3*dx/(x^2-1),这一步怎么解出来的?还有∫xdx/[4-x^2+(4-x^2)^1/2]=∫[1/(4-x^2)^1/2+1]*xdx/(4-x^2)^1/2,这一步怎么解出来的,
∫dx/(x+1)^4/3*(x-1)^2/3=∫[(x-1)/(x+1)]^1/3*dx/(x^2-1),这一步怎么解出来的?
还有∫xdx/[4-x^2+(4-x^2)^1/2]=∫[1/(4-x^2)^1/2+1]*xdx/(4-x^2)^1/2,这一步怎么解出来的,

∫dx/(x+1)^4/3*(x-1)^2/3=∫[(x-1)/(x+1)]^1/3*dx/(x^2-1),这一步怎么解出来的?还有∫xdx/[4-x^2+(4-x^2)^1/2]=∫[1/(4-x^2)^1/2+1]*xdx/(4-x^2)^1/2,这一步怎么解出来的,
都是些简单变换而已.