The volume of the solid generated by revolving the region bounded by x2=4y and y2=4x about y=4 is to be solved using the circular ring method. The formula for solving for the volume is given by V= -S" x (r. ²-r. ²) dr. What is the expression corresponding to r,? 04-y 02√5-2²2 012² 04-2√x

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