MAT334--2020S > Chapter 2

2.3 textbook

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**Yan Zhou**:

I am quite confused about the value of $2+sin\theta$. We know $sin\theta = \frac{1}{2i}(z - \frac{1}{z})$,

it says that $2 + sin\theta = 2 +(\frac{1}{2}i)(z-\frac{1}{z})$. Is that a typo?

**Victor Ivrii**:

Yes, wrong sign in the middle (should be $\drac{1}{2i}=-\dfrac{i}{2}$) but the final result is correct

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