1. Compute the curvature of the following arclength-parametrized curves: a. a(s) = (coss, 六 cos s, sin s) b. a(s) = (1+s², ln(s + √1+ s²)) *c. a(s) = ((1+s)³/2, (1 − s)³/2, s), s € (−1, 1) 2. Calculate the unit tangent vector, principal normal, and curvature of the follc a circle of radius a: N(t) = (acost a sint) -