Posted by Kaamini on Friday, November 4, 2011 at 1:42pm.
y = 9/x + sqrt(cos x)
y' = -9/x^2 - .5sin x/sqrt(cos x)
y'(pi/3) = -9/(pi^2/9) - .5*sqrt(3)/2 / sqrt(.5)
= -81/pi^2 - sqrt(6)/4
= -8.819
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