Definition Suppose a vector function r(t):I→Rn ∫r(t)dt=R(t)+C where C is any constant vector. Suppose a vector function r(t)=⟨f(t),g(t),h(t)⟩:[a,b]→R3 ∫abr(t)dt=⟨∫abf(t)dt,∫abg(t)dt,∫abh(t)dt⟩=(∫abf(t)dt)i+(∫abg(t)dt)j+(∫abh(t)dt)k