Question

Find r ⃗ (t)' if r ⃗(t) =Ta ⃗ x (b ⃗ + Tc ⃗ ) where a ⃗ , b ⃗ , c ⃗ are constant vectors. (this is about calculus3)

The question says find the derivative of vector r sub t vector if the given r sub t vector = Ta ⃗ x (b ⃗ + Tc ⃗ )