3. For each function below explain why a naive construction wil be susceptible to significant rounding error (for r near certain values), and explain how to avoid thi:s error (b) f(x)=x-1 (1-cos x); (c) f(x) = (1-2)-1 (in-sinTZ); (d) f(x) = (cos(n+x)-cos )2-1; (e) f(x) = (e1+z-el-z)(2x)-1