Q 3. ( a ) Is V . W ( n . ( Vxw ) ) a scalar or a vector ? Explain ( b ) Let r(t) be a smooth vector-valued function. Compute d at [ rit) xy' (t ) ] and simplify as much as possible. at [ vit ) x 7 ' (t ) ] = v' ( t ) x V ' (t ) + * " ( t ) x Y ( t )