Use a power series to approximate the area of the region with an error of less than 0.0001. Use a graphing utility to verify the result. (Round your answer to four decimal places.) integral^1_0.7 cos (Squareroot x) dx integral^1_0.7 cos (Squareroot x) dx almostequalto sigma_n = 0 (-1)^n x^n/2n! = .4857