Author Topic: past test 2019 day problem 3B  (Read 308 times)

Yan Zhou

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past test 2019 day problem 3B
« on: February 21, 2020, 12:18:28 PM »
I think there are some typo in the answer of u(x,t).
$$u(x,t) =  6sin(x+3t) +  6sin(x-3t) $$ as $x>3t$,
$$u(x,t) = 6sin(x+3t) + 6sin(2(x-3t))$$ as $t<x<3t$.