Doubt from application of derivatives

#1

Question no 7

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#2

Question no 2 all parts

#3

For 2 part one use second order derivative and then you can see it easily

#4

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#5

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#6

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#7

Exercise 4 4th part,12th question and question 2 b part

#8

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#9

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#10

What about question 2 third part

#11

#12

Sorry but i didn't understand how you proved you didnt use lmvt

#13

Question no 4 all parts and question 5