(adsbygoogle = window.adsbygoogle || []).push({}); "Inverse" trig?

I'm trying to think of a word that describes the opposite of a trig function.

It's like inverse, but I know that's not exactly the right word because inverse means literally "1 over" the function.

It's the type of function you get when you press "2nd function" before you press Sin or Cos or whatever.

I'm pretty sure it starts with "i" ... does anyone know what I'm talking about?

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# Inverse trig?

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