## Related questions with answers

Question

Find ${\vec{f}} \ '(t)$ for the vector function, and state the domain of each derived function.

$\vec{f}(t)=3^{2 t^2} \bar{i}+\dfrac{2 t-3}{2 t+4} \hat{j}$

Solution

VerifiedStep 1

1 of 2Given the vector function

$f(t)=3^{2t^2}\hat{i}+\dfrac{2t-3}{2t+4}\hat{j}.$

Then

$\begin{aligned} f'(t) &=& 2t^23^{2t^2-1}4t\hat{i} +\dfrac{2(2t+4)-2(2t-3)}{(2t+4)^2}\hat{j}\\ &=& 8t^33^{2t^2-1}\hat{i}+\dfrac{14}{(2t+4)^2}\hat{j} \end{aligned}$

where the first equality holds from the Chain rule and Leibniz rule and the second one comes from the division rule.

The domain of the derived function $f'(t)$ is $\mathbb{R}\setminus\{-2\}$.

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