how to create the 4th derivative of a variable in matlab

To create the 4th derivative of a variable y in MATLAB, you can use the diff function four times on y. Here's an example:

main.m
syms x
y = sin(x); % example function
y4 = diff(y, x, 4); % 4th derivative of y with respect to x
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4 lines

In this example, y is the function of interest, and we take its 4th derivative with respect to x. The result is a symbolic expression for the 4th derivative of y.