Please solve it on paper with pen step by step ... SO i can understand

6. Turn in: Given the vector function r(1) =(cos 21 ) i + (sin 2/ ) j . Find the unit normal vector N . Simplify your answer when possible7. Turn in: Find the arc length of the space curve r = (e cost, e sint, e ) over the interval Ost $ 27 . As with problem involving sine and cosine, make good use of the trig identities and Algebra to simplify the integral. EXACT anwer required for credit.4. Turn in: Given the vector function r '(t) = V1 +1 it (e ' ) j+ - k with the initial conditions 1+1 r(0) =(0,0,1) . Determine r(1) = r (t) di