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math121b:midterm2 [2020/04/11 19:01] pzhou [3. Bessel Function (30 points)] |
math121b:midterm2 [2020/04/12 08:57] pzhou [4. Solving PDE with separation of variables (30 points)] |
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$$ u(0, \theta) = \cos^2(\theta). $$ | $$ u(0, \theta) = \cos^2(\theta). $$ | ||
+ | Hint: you may find the following formula useful | ||
+ | $$\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta) = 2 \cos^2 \theta - 1. $$ | ||