% Using four-digit rounding arithmetic to compute 
% "f(x) = [x*cos(x)-sin(x)] / [x-sin(x)]" at x = 0.1
x = roundk(0.1,4);

% calculate cos(0.1) & sin(0.1)
c = roundk(cos(x),4);
s = roundk(sin(x),4);

% numerator = x*cos(x)-sin(x)
% denominator = x-sin(x)
numerator = roundk(roundk(x*c,4)-s,4);
denominator = roundk(roundk(x,4)-roundk(s,4),4);

% answer_11b = f(x)
answer_11b = roundk(numerator/denominator,4)