MATLAB PLEASE!

function y = oneminuscos (x)

%Compute 1 - cos(x) for scalar real inputs in the range -1 < x < 1 %with fractional error under 10*eps. %For example, it should return oneminuscos(1E-8) = -2.2204e-15

Hint: Subtracting 1 cos(x) directly incurs subtractive cancellation when x is close to 0, but for such values of x, the truncation error from using the first few terms of the Taylor series of cos(x) with a = 0 and canceling out the 1 analytically is very small.