Posted by Anonymous on Friday, November 16, 2012 at 11:46pm.
since (√(9x^2-1))^2 = 9x^2-1,
I assume you mean arctan^2 √(9x^2-1)
let u = 9x^2-1
y = arctan^2 (√u)
y' = 2 arctan(√u) * 1/(u+1) * 1/(2√u) u'
= 2 arctan(√9x^2-1) * 1/(9x^2) * 1/(2√(9x^2-1)) * 18x
= 2 arctan(√9x^2-1) / [x √(9x^2-1)]
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