Question Number 167402 by mkam last updated on 15/Mar/22
![find (d^n /dx^n ) [ ln (cosx) ]](Q167402.png)
$$\boldsymbol{{find}}\:\frac{\boldsymbol{{d}}^{\boldsymbol{{n}}} }{\boldsymbol{{dx}}^{\boldsymbol{{n}}} }\:\left[\:\boldsymbol{{ln}}\:\left(\boldsymbol{{cosx}}\right)\:\right] \\ $$
Commented by DrHZ last updated on 15/Mar/22
I think this is wrong!
Commented by mkam last updated on 16/Mar/22
$${why}\:? \\ $$