A.7 Find the complex conjugates of the following: a. * iy b. ixy? c. xy(x + iy + 2) d. (x + iy)/z f. 54.3 e. eix A.9 Prove the Euler formula, pix cos x + i sin x, using the Taylor series expansions for these functions. = RT A.11 Evaluate the derivatives with respect to x for the following functions. a. f(x) (x + 1)1/2 [x/(x + 1)]1/2 x + c. f(x) exp[x1/2] exp[cos x] b. f(x) = = d. f(x) =