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Question 01 (h) 

The function has

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Hint 

Calculate the derivatives. A critical point at occurs when . To determine the type of critical point at , consider the sign of . 
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Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. and so at . for negative near and for positive near . Thus the concavity of changes at and has a point of inflection at . Answer is D. 