math121b:midterm2
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math121b:midterm2 [2020/04/11 19:01] pzhou [3. Bessel Function (30 points)] |
math121b:midterm2 [2020/04/19 23:06] (current) pzhou [3. Bessel Function (30 points)] |
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| 4. Problem 20.3, 20.6, 20.7 (6 points) | 4. Problem 20.3, 20.6, 20.7 (6 points) | ||
| + | * 20.3: $ 4/\pi$ | ||
| + | * 20.6: $-1/ | ||
| + | * 20.7: $(1/x) e^{i (x - (n+1) \pi /2)} $ | ||
| ===== 4. Solving PDE with separation of variables (30 points) ===== | ===== 4. Solving PDE with separation of variables (30 points) ===== | ||
| Line 63: | Line 66: | ||
| $$ u(0, \theta) = \cos^2(\theta). $$ | $$ u(0, \theta) = \cos^2(\theta). $$ | ||
| + | Hint: you may find the following formula useful | ||
| + | $$\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta) = 2 \cos^2 \theta - 1. $$ | ||
math121b/midterm2.1586656897.txt.gz · Last modified: 2020/04/11 19:01 by pzhou
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