Barrons AP Calculus

NOTE:   We  can rewrite     comparing   to      we  see that    the

numerator       and denominator     therefore   

(A)

(D)

(C) See the figure  below,  which   shows   that    the length  of  a   semicircle  of

radius  2   is  needed  here.   The answer  can,    of  course, be  found   by  using   the

formula for arc length: