MATLAB is the language if it helps you but i think by help would be better? i tried and couldn't figure it out

The Maclaurin series expansion for the cosine is cosx=12!x2+4!x46!x6+8!x8 (a) Prove that this Maclaurin series expansion is a special case of the Taylor series expansion with xi=0 and h=x. (b) Use the Taylor series to estimate f(x)=sinx at xi+1=5/6 with xi=/2. Employ the zero-, first-, second-, third-order versions, and compute the true error for each case. Hint: think about how can Rn and ct be related. You can do this problem by hand