# Some kind of proving qn

• October 7th 2008, 03:43 AM
maybeline9216
Some kind of proving qn
Given y= sqr x + ln sqr x, prove that dy/dx = (x + sqr x)/ (2x x sqr x)
• October 7th 2008, 04:12 AM
mr fantastic
Quote:

Originally Posted by maybeline9216
Given y= sqr x + ln sqr x, prove that dy/dx = (x + sqr x)/ (2x x sqr x)

$y = x^{1/2} + \ln x^{1/2} = x^{1/2} + \frac{1}{2} \, \ln x$.

Where do you get stuck when differentiating? Take care with the simplifying.
• October 7th 2008, 04:34 AM
maybeline9216
Quote:

Originally Posted by mr fantastic
$y = x^{1/2} + \ln x^{1/2} = x^{1/2} + \frac{1}{2} \, \ln x$.

Where do you get stuck when differentiating? Take care with the simplifying.

Thanks i got it already =)