Suppose u is a differentiable function at t = 0 with u(0) = (0,5,3) and u'(0) = (0, -5,4). Use this information to evaluate $\frac{d}{dt}(u(t)\cos t)|_{t=0}$.
Select the correct choice below and fill in the answer box(es) to complete your choice.
A. The value of $\frac{d}{dt}(u(t)\cos t)|_{t=0}$ is the scalar $
$B. The value of $\frac{d}{dt}(u(t)\cos t)|_{t=0}$ is the vector $\langle$,$,$\rangle$.
