How to do manual operation of cross multiplication or substitution?

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syms A B x
y = A*x^2 + B*x;
dy = diff(y)
d2y = diff(dy)
then how to get where d2y is the second derivation; using subs or any other command in MATLAB

Answers (1)

Chunru on 12 Dec 2021
Is this what you want?
syms A B x z
y = A*x^2 + B*x;
dy = diff(y)
dy = 
d2y = diff(dy)
d2y = 
z = d2y/x^2
z = 
Chunru on 14 Dec 2021
subs and eval are for different purposes (not in your questions)

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