Question: Show that the standing wave f(z, t) = A sin(kz) cos(kvt) satisfies the wave equation, and express it as the sum of a wave traveling

Show that the standing wave f(z, t) = A sin(kz) cos(kvt) satisfies the wave equation, and express it as the sum of a wave traveling to the left and a wave traveling to the right (Eq. 9.6).

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