Hello, I have plotted a few figures as shown below. Now i would like to plot the tangents to each of these curves. How can i do that?

I have searched on the forum but could not get any definitive answer.

The code for this graph is divided in 2 functions as shown below:

`function [x,y_val] = plot_trial(Z)g = 9.8; K = 0.3; % g is the gravitational accleration`

y = @(V_d) (1/(2*g*K^2))*(V_d.^2/Z^2);x = linspace(0,1,100);y_val = y(x);endclc; clear; close all;% Use the other function 'plot_trial()'

[v_d1, y_val1] = plot_trial(1);[~,y_val2]= plot_trial(2);[~,y_val3]= plot_trial(3);figurehold onplot(v_d1, y_val1,v_d1,y_val2,v_d1,y_val3)legend('Z=1','Z=2','Z=3')title('Der Tank (Konstante Querschnittsfläche)')xlabel('dV1/dt')ylabel('Y')

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