If a = t^2 i - (4-t)j
and b = i + t j
show d/dt (a.b) = (a x db/dt) + (da/dt x b)I know you have to multiply the vectors a and b
then do da/dt
then db/dt
and times db/dt with a
and times da/dt with b
that should be the proof
However, I don't know how to multiply the vectors!
Can someone please...