Question: 4. Evaluate the following integral by changing the variables.(b)(8 points)D4dA where Dis the region bounded byx2+y2=42 and y=0.(c)(15 points) Use the transformation x=2vcos(u),y=4vsin(u)to evaluate the

4. Evaluate the following integral by changing the variables.(b)(8 points)D4dA where Dis the region bounded byx2+y2=42 and y=0.(c)(15 points) Use the transformation x=2vcos(u),y=4vsin(u)to evaluate the area ofR boundedbyx222+y242=1

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