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Question: Problems with the collect command

Question:Problems with the collect command

carmar 20 Maple 18
collect
June 05 2017
2

Please, can someone give me a hand? I can not understand why in the first case the collect command does not work while the second one works correctly. Many thanks for your attention.trasformaziione_equazioni1.mw
 

> 

esp1 := -a^4+a^2*c^2

-a^4+a^2*c^2

 (1)
> 

esp2 := collect(esp1, a^2);
This, apparently, does not work properly

-a^4+a^2*c^2

 (2)
> 

esp3 := collect(-a^4+a^2*c^2, a^2);

-a^4+a^2*c^2

 (3)
> 

esp11 := -a^2*x^2-a^2*y^2+c^2*x^2

-a^2*x^2-a^2*y^2+c^2*x^2

 (4)
> 

esp12 := collect(esp11, x^2);

(-a^2+c^2)*x^2-a^2*y^2

 (5)
> 

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