| a+b | a−b | |||
sina + sinb = 2sin( | )cos( | ) | ||
| 2 | 2 |
| a+b | a−b | |||
cosa + cosb = 2cos( | )cos( | ) | ||
| 2 | 2 |
| π | ||
3x = π − | + kπ | |
| 3 |
| x+3x | x−3x | |||
sinx+sin3x = 2sin | cos | = 2sin(2x)*cos(−x) = 2sin(2x)*cosx | ||
| 2 | 2 |
| 1 | ||
sin2x = 0 ∨ cosx(x)= | ||
| 2 |
| π | ||
2x=0+2kπ ∨ x= | +2kπ | |
| 3 |
| π | ||
x = kπ ∨ x= | +2kπ | |
| 3 |
| π | ||
3x = π− | +kπ | |
| 3 |
| 2π | ||
3x = | +kπ | |
| 3 |
| 2π | kπ | 2π+3kπ | (3k+2)π | |||||
x = | + | = | = | |||||
| 9 | 3 | 9 | 9 |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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