Mathematics
8 Online
OpenStudy (anonymous):
derivative of exponents
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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?
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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
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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
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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
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hartnn (hartnn):
correct! and welcome ^_^