在(-1,1)上,1/(1+x^2)的一个原函数是() A、arctan(1/x) B、-arccot(1/x) C、-arctan((1-x)/(1+x))D、arccot((1+x)/(1-x))
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![在(-1,1)上,1/(1+x^2)的一个原函数是() A、arctan(1/x) B、-arccot(1/x) C、-arctan((1-x)/(1+x))D、arccot((1+x)/(1-x))](/uploads/image/z/7240743-63-3.jpg?t=%E5%9C%A8%EF%BC%88-1%2C1%EF%BC%89%E4%B8%8A%2C1%2F%281%2Bx%5E2%29%E7%9A%84%E4%B8%80%E4%B8%AA%E5%8E%9F%E5%87%BD%E6%95%B0%E6%98%AF%EF%BC%88%EF%BC%89+A%E3%80%81arctan%281%2Fx%29+B%E3%80%81-arccot%281%2Fx%29+C%E3%80%81-arctan%28%281-x%29%2F%281%2Bx%29%29D%E3%80%81arccot%28%281%2Bx%29%2F%281-x%29%29)
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