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Mathematics 8 Online
OpenStudy (anonymous):

derivative of exponents

OpenStudy (anonymous):

\[y=\sqrt{x ^{x}}\]

OpenStudy (anonymous):

would this be equivalent to\[y=x ^{\frac{ 1 }{ 2 }x}\]

OpenStudy (anonymous):

then I could take the ln and use derivative\[\ln y=\frac{ 1 }{ 2 }x\]

OpenStudy (anonymous):

you just use chain rule

OpenStudy (anonymous):

can you explain?

OpenStudy (anonymous):

f prime of g(x)

OpenStudy (anonymous):

square root of x^n is two functions

OpenStudy (anonymous):

the base of square root is x^1/2

OpenStudy (anonymous):

derivative of x^1/2 and plug x^n in times the derivative of x^n

OpenStudy (anonymous):

Im not sure how to do that I see what you're saying but Im stuck

OpenStudy (anonymous):

would it be \[y=\frac{ 1 }{ 2\sqrt{x} }\sqrt{x}x ^{\frac{ 1 }{ 2 }-1}\]

OpenStudy (anonymous):

@aznandmaths

OpenStudy (phi):

you could use \[ x = e^{\ln(x)} \] and write the problem as \[ \sqrt{x ^{x}} = x^\frac{x}{2} = e^\frac{x\ln(x)}{2} \]

OpenStudy (anonymous):

could I still take the ln though as you have it in the second step so that it is \[lny=\frac{ x }{ 2 }lnx\]

hartnn (hartnn):

yes, thats correct now you'll need product rule for right side

OpenStudy (anonymous):

so it would be \[\frac{ y' }{ y }=1/2lnx+1/2\]

hartnn (hartnn):

correct

hartnn (hartnn):

rewrite y as sqrt (x^x)

OpenStudy (anonymous):

\[y'=\frac{ 1 }{ 2 }\sqrt{x ^{x}}(lnx+1)\]

OpenStudy (anonymous):

thank you so much

hartnn (hartnn):

correct! and welcome ^_^

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