Differentiate the following w.r.t. x    xx + (1 + x)log x f

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 Multiple Choice QuestionsShort Answer Type

261. Differentiate x.logx.log(log x)w.r.t.x.
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 Multiple Choice QuestionsShort Answer Type

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269. Differentiate the following w.r.t. x :
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270.

Differentiate the following w.r.t. x 
   xx + (1 + x)log x


Let space straight y equals straight x to the power of straight x plus left parenthesis 1 space plus space straight x right parenthesis to the power of log space straight x end exponent
Put space straight x to the power of straight x equals straight u comma space left parenthesis 1 space plus space straight x right parenthesis to the power of log space straight x end exponent equals straight v
therefore space straight y equals straight u plus straight v space
therefore space dy over dx equals du over dx plus dv over dx space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space... left parenthesis 1 right parenthesis
Now space straight u equals straight x to the power of straight x
therefore space log space straight u equals log space straight x to the power of straight x
therefore space 1 over straight u du over dx equals straight x.1 over straight x plus log space straight x.1
therefore space du over dx equals straight x to the power of straight x left square bracket 1 plus log space straight x right square bracket space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space... left parenthesis 2 right parenthesis
Also space straight v equals left parenthesis 1 space plus space straight x right parenthesis to the power of log space straight x end exponent
therefore space log space straight v equals log left parenthesis 1 space plus space straight x right parenthesis to the power of log space straight x end exponent equals log left parenthesis 1 plus straight x right parenthesis
therefore space 1 over straight v dv over dx equals left parenthesis log space straight x right parenthesis cross times fraction numerator 1 over denominator 1 plus straight x end fraction plus log left parenthesis 1 plus straight x right parenthesis
therefore space dv over dx equals left parenthesis 1 space plus space straight x right parenthesis to the power of log space straight x end exponent open square brackets fraction numerator log space straight x over denominator 1 plus straight x end fraction plus fraction numerator log left parenthesis 1 plus straight x right parenthesis over denominator straight x end fraction close square brackets space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space... left parenthesis 3 right parenthesis
From space left parenthesis 1 right parenthesis comma space left parenthesis 2 right parenthesis space and space left parenthesis 3 right parenthesis comma space we space get comma
space space space space space dy over dx equals straight x to the power of straight x left parenthesis 1 plus log space straight x right parenthesis plus left parenthesis 1 plus straight x right parenthesis to the power of log space straight x end exponent open square brackets fraction numerator log space straight x over denominator 1 plus straight x end fraction plus fraction numerator log left parenthesis 1 plus straight x right parenthesis over denominator straight x end fraction close square brackets
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