段階的に解決し、 人工知能を使用せず、 優れた仕事を行います ご支援ありがとうございました SOLVE STEP BY STEP IN DIGITAL FORMAT DONT USE CHATGPT 27. Show that the function f(x, y) = sin(x+y)+cos(x-y) satisfies the wave equation 8²f8²f 0x² dy² =0. (0) The wave equation is an example of a partial differential equation.

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