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Issue with the arccos on my TI-COLLEGE-PLUS calculator

Yuki24 -  
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Hello everyone,
I’m coming to this forum to ask you a question. Indeed, I recently had a problem with my TI-COLLEGE-PLUS calculator: when I use the arccos() function and input, for example, the number 9, the calculator returns an error message that says "INVALID DOMAIN Error," but I can't understand where the problem comes from... could someone please help me?

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julien_7324 Posted messages 109 Registration date   Status Membre Last intervention   27
 
Hello, I understand your mistake.
In fact, you need to insert a number less than 1.
For example, insert 0.9. You won't receive an error message.
Now insert 1.1. There you will get the error message.
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Thank you very much, you are saving my life

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