| z+2i | ||
{z ∊ C, Im | = 0} | |
| iz+1 |
| z+2i | z−i+3i | 1 | 3i | 3 | |||||
= | = | + | = −i+ | = | |||||
| i(z−i) | i(z−i) | i | i(z−i) | x+(y−1)i |
| 3(x−(y−1)i) | 3x−3i(y−1) | |||
−i+ | = −i + | |||
| x2+(y−1)2 | x2+(y−1)2 |
| z+2i | 3(y−1) | |||
Im | = −1− | |||
| iz+1 | x2+(y−1)2 |
| 3(y−1) | ||
−1− | = 0 | |
| x2+(y−1)2 |
| π−x | π−x | |||
1+tg2( | )=[1=tg( | )]2 | ||
| 2 | 2 |
| π−x | π−x | π−x | ||||
1+tg2( | )=1+2tg( | )+tg2( | ) | |||
| 2 | 2 | 2 |