arc x and Arc x

What's the difference between a lower-cased arc x and an upper-cased Arc x? (in sinusoids)

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Originally Posted by Noraowolf1

What's the difference between a lower-cased arc x and an upper-cased Arc x? (in sinusoids)

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Dear Noraowolf1,

As far as I know there is no difference. Normally the inverse functions of sine, cosine, tangent, etc are written arcsin, arccos with lowercase letters.

Hello, Noraowolf1!

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What's the difference between a lower-cased and an upper-cased ?

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I was told (many years ago) that indicated the principal value of

. . That is: .


But I've met no one who uses that interpretation.