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Evaluate the integral by making an appropriate change of variables.. 11 3 sin(49x2 + 81y2) dA, where R is the region in the first

$Evaluate the integral by making an appropriate change of variables. ( iint_{R} 3 sin left(49 x^{2}+81 y^{2}right) d A )$

Evaluate the integral by making an appropriate change of variables.. 11 3 sin(49x2 + 81y2) dA, where R is the region in the first quadrant bounded by the ellipse 49x2 + 81y2 = 1

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