Let a) if , use to find i got it down to but h...

Answers ( 1 )

  1. jacob chen
    jacob chen
    then =
    we use the formula


            by direct substitution

    (b) which is not defined for x=0 so f'(0) doesnot exist
    (c) Since from part (a) we have
    so at x=0 the function has a vertical tangent

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