APM346-2015F > Textbook errors

Missing r in section 6.3

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Xi Yue Wang:
http://www.math.toronto.edu/courses/apm346h1/20159/PDE-textbook/Chapter6/S6.3.html
For the fifth line, Cartesian coordinates by $ x=rcos(θ), y=sin(θ)$, there should have $r$ before $sin(\theta)$.

OK

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