| 2 | ||
tgα+ctgα= | ||
| sin(2α) |
| 2 | 2 | 2 | ||||
L= | + | − | = | |||
| sin30o | sin18o | sin54o |
| 1 | 1 | sin54o−sin18o | ||||
= 2( 2+ | − | )= 2(+2 + | )= | |||
| sin18o | sin54o | sin18ocos36o |
| 2cos36o*sin18o | ||
= 2(2+ | =2(2+2)=8∊N | |
| sin18o*cos36o |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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