r=1+cosx
∫0π r2π dx = π∫0π 1+cosx dx = π [ x + sinx ]0π = π2
V=π2
| 3 | 1 | |||
π∫0π 1+2cosx+cos2x dx = π∫0π | + 2cosx+ | cos(2x) dx = | ||
| 2 | 2 |
| 3 | 1 | 3 | ||||
= π [ | x + 2sinx + | sin(2x) ]0π = | π2 | |||
| 2 | 4 | 2 |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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