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∫负无穷到正无穷1/x^2+2x+2dx
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∫负无穷到正无穷1/x^2+2x+2dx
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∫负无穷到正无穷1/(x^2+2x+2)dx
=∫负无穷到正无穷1/[(x+1)^2+1]dx
=∫负无穷到正无穷1/1/[(x+1)^2+1]d(x+1)
=arctan(x+1)│负无穷到正无穷
=π/2-(-π/2)
=π
=∫负无穷到正无穷1/[(x+1)^2+1]dx
=∫负无穷到正无穷1/1/[(x+1)^2+1]d(x+1)
=arctan(x+1)│负无穷到正无穷
=π/2-(-π/2)
=π
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