求解该函数在两种情形下对应点x处的二阶导数值,请给出思路与程序,谢谢
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- threenewbee 2023-04-10 18:03关注
syms a x y = a*exp(x)/sqrt(a+x^2); y_1 = diff(y, x); y_2 = diff(y_1, x); a1 = 2; x1 = 3*a1; y2_1 = double(subs(y_2, [a, x], [a1, x1])); a2 = 3; x2 = 2*a2; y2_2 = double(subs(y_2, [a, x], [a2, x2])); disp(['a=2, x=3a, y2 = ' num2str(y2_1)]); disp(['a=3, x=2a, y2 = ' num2str(y2_2)]);
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