Express the integral f (x² + y²) dA as an iterated integral using polar coordinates if R is the region enclosed by y = √81 x² and the lines y = x and y = -x. (Give exact answers. Use symbolic notation and fractions where needed.) 0₂ [₂ (x² + y²) dA = √°³² √² 0₁ f(r, 0) dr de

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