57. The series 2x5 17x7 62x⁹ + + 3 15 315 2835 converges to tan x for -π/2 < x < π/2. a. Find the first five terms of the series for In | sec x|. For what values of x should the series converge? tan x = x + + b. Find the first five terms of the series for sec² x. For what values of x should this series converge? c. Check your result in part (b) by squaring the series given for sec x in Exercise 58.