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=<br />
=<br />
2π<br />
(<br />
2 2<br />
ρ sin θ 1)<br />
∫ ∫ +<br />
0<br />
2<br />
0<br />
2<br />
2 dθ ρdρ<br />
64 2 π<br />
2 π<br />
× ∫<br />
2<br />
1<br />
2 sin θdθ<br />
+ 2∫<br />
× 8dθ<br />
4 0<br />
0 2<br />
= 32 π +<br />
= 48π<br />
16π
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