(b) Given the power series f(x)=1-x-2x³ - 4x4 To(x) = 1 T₁(x) = x T₂(x) = 2x² - 1 T3(x) 4x²-3x = T₁(x) 8x48x²+1, = and the Chebyshev polynomials economize the power series f(x) twice.

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