(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

3. The attempt at a solution

I don't understand how in the final step they got the numerator. Where's the 45 come from? what happened to 2t+1?, or in the denominator they got (2t+1) raised to the 10th power.

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# Find the derivative of the function

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