Determine the second derivative of $f(x)=x^2$.

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Lesson Parent: 
Differentiation VI: Higher Order Derivatives
Problem: 

Determine the second derivative of $f(x)=x^2$.

Answer: 

2

SAMPLE SOLUTION

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Solution: 

The second derivative is denoted by

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But we know that

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So now we need to determine

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We know that

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because