Product Rule Derivative Problem

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SUMMARY

The discussion revolves around differentiating the function h(t) = √t(1-t²) using the product rule. The correct derivative, as stated in the textbook, is (1 - 5t²)/(2√t). The error in the initial solution was due to an incorrect simplification of the term t^{1/2}(-2t) to -2√t. The correct approach involves properly applying the product rule and simplifying the terms accurately to arrive at the textbook's answer.

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Homework Statement



Use the product rule to differentiate the function:

h(t) = √t(1-t2)

Homework Equations



d/dx[f(x)g(x)] = f(x)g'(x) + g(x)f'(x)

The Attempt at a Solution



(see attachment image)

I checked the back of the textbook and my solution was wrong. The textbook says the answer is (1 - 5t2)/(2√t). What did I do wrong? How do you get this answer?
 

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Between lines 3 and 4 of your work you incorrectly simplified the first term like this:
[tex]t^{\frac{1}{2}}(-2t)=-2\sqrt t[/tex]Otherwise, I agree with your work.
 
Last edited:
Ahh good catch. You would then just do (-2t√t)(2√t) and get -4t2. Add that to 1 - t2 on the numerator and you get (1 - 5t2) / 2√t, the correct answer in the textbook. Thanks.
 

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