Find the first four non-zero terms of the Maclaurin series for f(x)=cos(x)f(x) = \cos(x)f(x)=cos(x).
1−x22!+x44!−x66!1 - \frac{x^2}{2!} + \frac{x^4}{4!} - \frac{x^6}{6!}1−2!x2+4!x4−6!x6
x−x33!+x55!−x77!x - \frac{x^3}{3!} + \frac{x^5}{5!} - \frac{x^7}{7!}x−3!x3+5!x5−7!x7
1−x2+x42−x661 - x^2 + \frac{x^4}{2} - \frac{x^6}{6}1−x2+2x4−6x6
1−x2+x24−x381 - \frac{x}{2} + \frac{x^2}{4} - \frac{x^3}{8}1−2x+4x2−8x3