extreme values of the function

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Using analytical method, find the extreme values of the functions on the interval and where they occur.

1. f(x) = ln(x+1), 0<=x<=3

2. f(x) = sin(x+ pi/4), 0<=x<=(7pi)/4

Thanks in advance.

  • extreme values of the function -

    1. d/dx ln (x+1)+d/dx(x+1)
    *remember to use the chain rule
    =1/x+1 + 1

    endpoints: plug in the numbers of the interval
    f(0)=ln1=0
    f(3)=ln(3+1)=ln4=1.386

    maximum:ln4 at x=3
    minimum:0 at x=0

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