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Answer on Calculus Question for hsd

Question #17673
Find the absolute maximum and minimum values of the following function over the given interval. If there are multiple points in a single category list the points in increasing order in x value and enter N in any blank that you don't need to use.

f(x)=(9cosx)/(14+7sinx), 0≤x≤2π

Absolute maxima
x = y =
x = y =
x = y =

Absolute minima
x = y =
x = y =
x = y =
Expert's answer
function is continuous so we can check only points x=0,x=2pi and x where f'=0 when x=0 and x=2pi we get the same value f(x)=9/14
f'(x)=-(9 (1+2 sin(x)))/(7 (2+sin(x))^2)
f'(x)=0 so 1+2sin(x)=0 so x=7pi/6, x=11pi/6

x=7pi/6, f(x)=-3sqrt(3)/7
x=11pi/6 , f(x)=-3sqrt(3)/7

so absolute maxima
x=0, y=9/14
x=2pi, y=9/14
absolute minima
x=7pi/6 y=-3sqrt(3)/7
x=11pi/6 y=-3sqrt(3)/7

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