@vv thank you very much.

@vv thank, how can i find z without LambertW?

@vv Thank you very much

@vv Thank you sir, so embarrased, but i'm not good at integral.

Yes, i think my integral and my test is much different from that. 

So, can you help me about use maple to solve this exam in the images.

Sorry  to bother you.

Thank you

Dear sir, i tried but i can't find an exam like this.

Can you teach me the steps to solve the exam like this on Maple, or send me a link to download the worksheet.

Sorry for my terrible english.

Thank you