How to do manual operation of cross multiplication or substitution?

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Muhammad Usman
Muhammad Usman 2021-12-12
评论： Chunru 2021-12-14
If
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

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回答（1 个）

Chunru
Chunru 2021-12-12
Ran in:
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 = 
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