Find the Maclaurin series for the function f(x) = (x - 1) /(x + 1) .
a) f(x) = -2 + 4x - 8x² + 16x³ - ...
b) f(x) = 2 + 4x + 8x² + 16x³ + ...
c) f(x) = -2 - 4x - 8x² - 16x³ - ...
d) f(x) = 2 - 4x + 8x² - 16x³ + ...