∫dx/(x+(1-x²))求积分

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∫dx/(x+(1-x²))求积分∫dx/(x+(1-x²))求积分∫dx/(x+(1-x²))求积分 

∫dx/(x+(1-x²))求积分
∫dx/(x+(1-x²))求积分

∫dx/(x+(1-x²))求积分