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#18 Problem#4||PDE by direct integration||(𝝏^𝟐 𝒛)/𝝏𝒙𝝏𝒚=𝒔𝒊𝒏𝒙𝒔𝒊𝒏𝒚,||𝝏𝒛/𝝏𝒚=−𝟐𝒔𝒊𝒏𝒚, 𝒙=𝟎 and 𝒛=𝟎 𝒚=𝝅/𝟐||

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