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// PG (227)
deff('[y]=f(x)','y=exp(x)')
c3=0.994571+0.997308*x+0.542991*x^2+0.177347*x^3;
norm(exp(x)-c3,'inf')
// as obtained in the example 6, c4 = 0.00547, T4(x) = (-1)
// c4*T4(x) = 0.00547 * (-1)
// norm(exp(x)-q3,'inf') = 0.00553
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