Thursday, March 28, 2013

Using l'Hopital' Rule, find the limit of x^x^2 as x approaches 0 from the right.

We have to find the value of lim x-->0+
[(x^x)^2)]


lim x-->0+
[(x^x)^2)]


=> lim x-->0+ [e^(ln
((x^x)^2))]


=> lim x-->0+ [e^(ln
((x^2x))]


=> lim x-->0+ [e^(2x*ln
x)]


As the exponential function is continuous we can write
this as


=> e^[lim x-->0+ (2x*ln
x)]


As 2x*ln is of the indeterminate form we can use
l'Hopital's rule


lim x-->0+ (2x*ln
x)


=> lim x-->0+ (2*ln
x/(1/x))


=> lim x-->0+
(2*(1/x)/(-1/x^2)


=> lim x-->0+
(-2*x^2/x)


=> lim x-->0+
(-2*x)


substitute x =
0


=> 0


Now we have e^0
= 1


This gives the value of lim x-->0+
[(x^x)^2)] = 1

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