wredulus_pospolitus:
to nie F(x) = 2 tylko F(x
o) = 2 bo to tylko taki ma sens\
najlepiej od wyliczenia tej całki:
| | 2lnx + 1 | | lnx | | dx | |
∫ |
| dx = 2∫ |
| dx + ∫ |
| = ln2x + lnx + C |
| | x | | x | | x | |
F(x) = ln
2x + lnx
ln
2x + lnx = 2
ln
2x + lnx − 2 = 0
t = lnx
t
2 + t − 2 = 0
(t−1)(t+2) = 0
t = 1 −−−> lnx = 1 −−−> x = e
t = −2 −−−> lnx = −2 −−−> x = e
−2
koooniec