Mathematics
Undergraduate
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ψ(x,y)=1/2ln(x^2+y^2)(x^2+y^2≠0), w(x,y)=∂^aψ/∂x^2+∂^2/dy^2とするときw(1,2)を求めよという問題なのですがψの偏微分が良く分かりません。答えとともに教えていただけるとありがたいです。
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