Consider the curve r (t) = (sin³ (t), cos³ (t), sin² (t)) for 0 ≤ t≤ π/2. Compute the following quantities at the point t = π/4. The unit normal vector N (4) = (−, −, −). (a component in first answer box, y component in second answer box, z component in third) The unit binormal vector B (4) = (−, —, —). (a component in first answer box, y component in second answer box, z component in third) The curvature (1)