The r in the problem is a constant, so you treat it as a number, not a variable that is part of the derivative.
this is how I derived it:
2x*(1/2)*(-2x)/sqrt(r^2-x^2) + 2*sqrt(r^2-x^2)
The 1/2 comes from the deriv of the sqrt, and the -2x is the deriv of the inside of the sqrt.
that...
Or you adjust the ebrake shoes at the rear wheels, the proper way. If you check through the section he linked to, it should have instructions some where in there.
Edit: here it is:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=BR&Page=45
If resting it on the ground doesnt work, set the end of the breaker bar 6-12" above the ground and then crank it so that the bar swings down and hits the floor,
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