Mobile Notice
You appear to be on a device with a "narrow" screen width (i.e. you are probably on a mobile phone). Due to the nature of the mathematics on this site it is best views in landscape mode. If your device is not in landscape mode many of the equations will run off the side of your device (should be able to scroll to see them) and some of the menu items will be cut off due to the narrow screen width.
Section 12.7 : Calculus with Vector Functions
6. Compute the derivative of the following limit.
\[\vec r\left( t \right) = \left\langle {\frac{{t + 1}}{{t - 1}},\tan \left( {4t} \right),{{\sin }^2}\left( t \right)} \right\rangle \] Show SolutionThere really isn’t a lot to do here with this problem. All we need to do is take the derivative of all the components of the vector.
\[\begin{align*}\vec r'\left( t \right) & = \left\langle {\frac{{\left( 1 \right)\left( {t - 1} \right) - \left( {t + 1} \right)\left( 1 \right)}}{{{{\left( {t - 1} \right)}^2}}},4se{c^2}\left( {4t} \right),2\sin \left( t \right)\cos \left( t \right)} \right\rangle \\ & = \require{bbox} \bbox[2pt,border:1px solid black]{{\left\langle {\frac{{ - 2}}{{{{\left( {t - 1} \right)}^2}}},4se{c^2}\left( {4t} \right),2\sin \left( t \right)\cos \left( t \right)} \right\rangle }}\end{align*}\]Make sure you haven’t forgotten your basic differentiation formulas such as the quotient rule (the first term) and the chain rule (the third term).