| df | |
= z+yex | |
| dx |
| df | |
= ex−1 | |
| dy |
| df | 1 | ||
= x + | |||
| dz | z |
| 1 | ||
x + | = 2 | |
| z |
| 11 | 1 | |||
x = 0, y= | , z= | |||
| 2 | 2 |
| 1 | ||
x+ | =2a | |
| z |
| 1 | ||
y=6a− | ||
| 2a |
| 1 | ||
z= | ||
| 2a |
| 1 | 1 | 1 | ||||
6a− | +ln | =6a− | ||||
| 2a | 2a | 2a |
| 1 | ||
a= | ||
| 2 |
| 1 | ||
więc punktem styczności jest (0, 2, | ) , a równanie szukanej płaszczyzny stycznej to | |
| 2 |
| 1 | ||
6(x−0)+0(y−2)+2(z− | )=0 | |
| 2 |