Question: Why I cant derivate with respet to time derivation?

What is incorrect I am getting the error:


 

``

> 

``

> 

restart:

> 

``

> 

y := (diff(tau(t), t))^2

(diff(tau(t), t))^2

(1)
> 

"(∂)/(∂ (tau)) y"

Error, invalid derivative

"(∂)/(∂ tau) y"

 
> 

``


 

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