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### Messages - Jing Yang

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##### Test 1 / Problem 1 Variant C&D 2018F
« on: October 14, 2020, 05:08:58 AM »
Are the last steps typos? Those are true if ln(a-b)=-ln(a+b). But I don't think the equation is true. Can anyone help me with that?

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##### Chapter 1 / Q10 in Section 1.3
« on: September 30, 2020, 11:48:24 AM »
Is there anyone who knows how to figure out this question? I used the polar representation of z that is $z=|z|e^{i\theta}$, and do the square of z. Is this step correct and what next? Thanks!

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