All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)

(ii)

Let

Since

We reject since

Required stationary value of

### KS Comments:

Students do not need to carry out the second derivative test since question only ask for the stationary value, instead of maximum of minimum. Question wants students to explain why there is one answer only, so a clear precise explanation will be expected.

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