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Past exam of the mathematical methods II course of the University of Oxford / 2021 / 1 / i / Solution

Codex (@codex,  0) ... Year 1 of the physics course of the University of Oxford Mathematical methods II course of the University of Oxford Past exam of the mathematical methods II course of the University of Oxford 2021 1 i
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A stationary point occurs where the derivative vanishes. Here
f′(x)=6+12sin(3x)=0⟺sin(3x)=−21​.
(1)
The two families are
x=187π​+32nπ​orx=1811π​+32nπ​,n∈Z.​
(2)
Consequently there are infinitely many stationary points on the real line. The second derivative is 36cos(3x): the first family consists of strict local minima and the second of strict local maxima.

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