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Limits and Derivatives

Short Answer Type

31.
Let f(x) $space space space space space equals space open curly brackets table attributes columnalign left end attributes row cell 1 minus straight x squared comma space straight x less or equal than 0 end cell row cell 1 plus straight x squared comma space straight x space greater than 0 end cell end table close$ find Lf'(0) and Rf'(0)

Is f derivable at x = 0?

Here, f(0) = 1-0²= 1

$space space space space space space space space space space space space space Lf apostrophe left parenthesis 0 right parenthesis space equals space limit as straight h rightwards arrow 0 to the power of minus of fraction numerator straight f left parenthesis 0 plus straight h right parenthesis minus straight f left parenthesis 0 right parenthesis over denominator straight h end fraction equals limit as straight h rightwards arrow 0 to the power of minus of fraction numerator straight f left parenthesis straight h right parenthesis minus 1 over denominator straight h end fraction$ (Note that here h < 0)

 $space space space space space space space space space space space space equals space space limit as straight h rightwards arrow 0 to the power of minus of fraction numerator 1 minus straight h squared minus 1 over denominator straight h end fraction equals limit as straight h rightwards arrow 0 to the power of minus of left parenthesis negative straight h right parenthesis space equals space 0$

$space space space space space space space space space space space space space Rf apostrophe left parenthesis 0 right parenthesis space equals space limit as straight h rightwards arrow 0 to the power of plus of fraction numerator straight f left parenthesis 0 plus straight h right parenthesis minus straight f left parenthesis 0 right parenthesis over denominator straight h end fraction equals limit as straight h rightwards arrow 0 to the power of plus of fraction numerator straight f left parenthesis straight h right parenthesis minus 1 over denominator straight h end fraction$ (Note that here h > 0)

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Clearly, Lf'(0) = 0 = Rf'(0) $rightwards double arrow$ f is derivable at x =0

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32. Find the derivative of the function f(x) = 99x at x= 100.

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33.

Let $space space space straight f left parenthesis straight x right parenthesis space equals space open curly brackets table attributes columnalign left end attributes row cell straight x plus straight a comma space straight x less or equal than 1 end cell row cell ax squared plus 1 comma space straight x greater than 1 end cell end table close$

find a so that f may be derivable at x =1.

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34.

If f is derivable at x=a, evaluate $space space space space space space space space space stack space lim with straight x rightwards arrow straight a below fraction numerator xf left parenthesis straight a right parenthesis minus af left parenthesis straight x right parenthesis over denominator straight x minus straight a end fraction$ .

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35.

For the function :

$space space space space space space space space straight f left parenthesis straight x right parenthesis space equals straight x to the power of 100 over 100 plus straight x to the power of 99 over 99 plus.... plus fraction numerator straight x squared 2 over denominator 2 end fraction plus straight x plus 1$ Prove that f(1) = 100 f'(0)