acosd returns a complex number

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Diana Dawoud 2020-11-13

编辑： Stephen23 2020-11-13

I'm trying to find acosd(15/9) in matalb but i'm getting 0.0000 +62.9458i, what dose that mean?

Stephen23 2020-11-13

编辑：Stephen23 2020-11-13

"I'm trying to find acosd(15/9) in matalb but i'm getting 0.0000 +62.9458i, what dose that mean?"

15/9
ans = 1.6667

What do you expect the arccosine to be for this value? Or, for that matter, for any value >1 ?

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