Posted by Kaamini on .
Evaluate the derivative of the function below at the point (ð/3, 9.301). (Round to three decimal places.)
y= (9/x) + ((cosx)^.5)

CALCULUS help please 
Steve,
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