40. [-/1 Points] DETAILS LARCALC12 12.5.032. Find the curvature K of the curve. r(t) = a cos(wt)i + b sin(wt)j K : Need Help? Read it 41. [-/1 Points] DETAILS LARCALC12 12.5.036. Find the curvature K of the curve r (t) = etti + ett cost j + ett sin t k K = Need Help? Read It 42. [-/2 Points] DETAILS LARCALC12 12.5.042.MI. Find the curvature and radius of curvature of the plane curve at the given value of x. y = 7x - _, > K= 1 Need Help? Read It Master It 43. [-/2 Points] DETAILS LARCALC12 12.5.052. Consider the following. y = = (a) Find the point on the curve at which the curvature K is a maximum. (Assume x > 0.) ( x, y ) = (L (b) Find the limit of the curvature K as x + co. lim K =