how can I solve this problem

The cosine function can be evaluated by the following infinite series: cosx=1-(x^2)/2!+(x^4)/4!-(x^6)/6!+..... Write a MATLAB code to implement this formula in order to compute the value of cosx up to any n order term (i.e. x=pi/5,n=10)

[James Tursa]

What have you done so far? What specific problems are you having with your code?

Answer 1

[Guðmundur]

 n = 10;
  x = pi/5;
  m = 0:2:2*n;
  s = ones(1,n+1);
  s(2:2:end) = -1;
  cosx = sum((x.^m./factorial(m)).*s);