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EXAMPLE 4Using Properties of Double Integrals

If R is a closed, bounded region, then

  1. (a)
  2. (b) \displaystyle\iint\limits_{\kern-3ptR} 8( x^{2}+y^{2})\, dA=8\displaystyle\iint\limits_{\kern-3ptR} ( x^{2}+y^{2})\, dA