What is the code for this cosine symbol?

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Salad Box
Salad Box 2023-1-19
评论： Salad Box 2023-1-20
Hi,
How to write the cos-1 in Matlab? Is it to only use 'cosd' or 'cosd' but with some to represent -1?
Has anyone seen the cos-1 expression before?

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Walter Roberson
Walter Roberson 2023-1-19
acosd
By convention, a trig function with a above it, represents the "arc" of the function

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