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diff --git a/usth/MATH2.2/final/EX3.m b/usth/MATH2.2/final/EX3.m
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-disp ("Question 3:");
-disp ("(a)");
-function y = f (x)
-  y = 2 + x.^2 + exp(x.*2 + 1);
-endfunction
-h = 0.005;
-printf ("By forward difference with h = 0.05, f'(1.35) = %g\n",
-        (f (1.35 + h) - f (1.35)) / h);
-
-disp ("(b)");
-disp ("I am unsure if diff is different on Matlab, but on octave,");
-disp ("it's simply taking differences between consecutive elements.");
-x = [1.35, 1.35+h];
-printf ("Using diff with h = 0.05, we get same result, f'(1.35) = %g\n",
-        (diff (f (x)) / h));
-disp ("Using symbolical methods, f'(1.35) = 83.5946 which is quite close.");