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\int \frac{1}{x^2+a^2} dx=\frac{1}{a}\arctan(\frac{x}{a})
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$$
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$$
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\int \frac{1}{\sqrt{x^2-a^2}} dx=\ln|x+\sqrt{x^2-a^2}|
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$$
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$$
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\int \frac{1}{\sqrt{x^2+a^2}} dx=\ln|x+\sqrt{x^2+a^2}|
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$$
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## Chapter 1 Complex Numbers
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