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Question Number 6174 by madscientist last updated on 17/Jun/16
prove the identity  ∫_∂D φ▽φ∙nds=∫∫_D (φ▽^(2 ) φ+▽φ∙▽φ)dA
provetheidentityDϕϕnds=D(ϕ2ϕ+ϕϕ)dA

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