Which of the following Maclaurin series contains only even powers of xxx?
cos(x)=1−x22!+x44!−⋯\cos(x) = 1 - \frac{x^2}{2!} + \frac{x^4}{4!} - \cdotscos(x)=1−2!x2+4!x4−⋯
sin(x)=x−x33!+x55!−⋯\sin(x) = x - \frac{x^3}{3!} + \frac{x^5}{5!} - \cdotssin(x)=x−3!x3+5!x5−⋯
ex=1+x+x22!+x33!+⋯e^x = 1 + x + \frac{x^2}{2!} + \frac{x^3}{3!} + \cdotsex=1+x+2!x2+3!x3+⋯
sinh(x)=x+x33!+x55!+⋯\sinh(x) = x + \frac{x^3}{3!} + \frac{x^5}{5!} + \cdotssinh(x)=x+3!x3+5!x5+⋯