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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!
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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 6 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!

The function f(t) is a product. Use the product rule and you should have no problem to determine the first differentiation.
Thank you so much everyone!!!

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