π | ||
cosx + cos(x− | )=0 | |
4 |
π | ||
cos(x) + cos(x − | ) = 0 | |
4 |
π | ||
cos(x − | = −cos(x) | |
4 |
π | ||
cos(x − | ) = cos(π − x) | |
4 |
x+x−π4 | x−x−π4 | π | π | |||||
2cos | *cos | = 2cos(x− | )cos | |||||
2 | 2 | 8 | 8 |
√2 | π | ||
cos(x− | )=0 | ||
2 | 8 |
π | π | |||
x − | = | + kπ | ||
8 | 2 |
5π | ||
x= | + kπ | |
8 |
5^2 | 52 |
2^{10} | 210 |
a_2 | a2 |
a_{25} | a25 |
p{2} | √2 |
p{81} | √81 |
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