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i need help on both these questions please!! 4. [15] The region between the graphs 3; = x2 and y = x4 is rotated about

i need help on both these questions please!!

4. [15] The region between the graphs 3; = x2 and y = x4 is rotated about the x-axis. Determine the volume of the surface of revolution. 5. [4x5] Determine with reason whether the following improper integrals converge and if so compute them: mfg"r cos(5x)dx (ii)/lnx(2x)dx. 0 1 no 1 dx . 1 (\"0/ m (1\") mm\"- 0 0

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