Help with differentiation

https://www.quora.com/profile/Bravewarrior/p-145811901
Here is the question and its solution. I am stuck on part b. Can someone please tell me what rules they have used to get to this answer? Thanks!

Original post by pigeonwarrior

https://www.quora.com/profile/Bravewarrior/p-145811901
Here is the question and its solution. I am stuck on part b. Can someone please tell me what rules they have used to get to this answer? Thanks!

Product rule as you have
(10-(t+1)/2) * ln(t+1)
so the product of two fairly simple functions of t, each of which can be easily differentiated.

(edited 3 months ago)

Original post by pigeonwarrior

https://www.quora.com/profile/Bravewarrior/p-145811901
Here is the question and its solution. I am stuck on part b. Can someone please tell me what rules they have used to get to this answer? Thanks!