initial commit / add all books

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diff --git a/75/CH4/EX4.9/ex_8.sce b/75/CH4/EX4.9/ex_8.sce
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+        //    PG (223)
+
+deff('[y]=f(x)','y=exp(x)')
+
+x=[-1.0 -0.6919 0.0310 0.7229 1.0];                // defining x
+
+r3 = 0.996294 + 0.997955*x + 0.536722*x^2 + 0.176139*x^3;
+norm(exp(x)-r3,'inf');    //    cubic least squares approximation
+deff('[y]=g(x)','y=0.994571+0.997308*x+0.542991*x^2+0.177347*x^3')
+//    c3=g(x);
+x1=x(1,1);
+(exp(x1)-g(x1))
+x2=x(1,2);
+(exp(x2)-g(x2))
+x3=x(1,3);
+(exp(x3)-g(x3))
+x4=x(1,4);
+(exp(x4)-g(x4))
+x5=x(1,5);
+(exp(x5)-g(x5))