=+20. Let Bnf(x) = E[f(Sn/n)] denote the Bernstein polynomial of degree n approximating f(x) as discussed in

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=+20. Let Bnf(x) = E[f(Sn/n)] denote the Bernstein polynomial of degree n approximating f(x) as discussed in Example 3.5.1. Prove that

(a) Bnf(x) is linear in f(x),

(b) Bnf(x) ≥ 0 if f(x) ≥ 0,

(c) Bnf(x) = f(x) if f(x) is linear,

(d) Bnx(1 − x) = n−1 n x(1 − x).

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