Vector-Valued Functions

Question

so I was given the question:

I assumed that I would do sin(7t)*cos(14t)=0. And solve for values of t that are in the interval. But how would I go about solving for these values?

Answer 1

If $\sin(7t)\cos(14t)=0$ then we either have $\sin(7t)=0$ or $\cos(14t)=0$. Can you go on from here?