Y=sech(tan‐¹x) find the derivative

How to solve it and what thw answer is

Ineed with number 17 i don’t get it at alll

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.