Report - · Web viewa 2 ∂ 2 z ∂ x 2 - ∂ 2 z ∂ y 2 transforms into 4 a 2 ∂ 2 z ∂u∂v .Q-8) If u = x2-y2 , v = 2xy , f(x,y) = ϕ (u,v) , then prove that ∂ 2 f ∂ x 2 + ∂ 2 f

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