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**Reuel****Member**- Registered: 2010-11-28
- Posts: 178

Hi there. I haven't been here in a while.

Is there a proper name for the interior part of a trigonometric function or is it simply called the inner function, or something to that effect? I have looked around online for an answer but I can't seem to find anything.

For example, the function

does g(x) have a proper term or name? Or is it just "the inner function"?

Thank you very much.

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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

You could say g(x) is the argument of the tangent function, but I don't think there is a proper name for such a function g(x).

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**Reuel****Member**- Registered: 2010-11-28
- Posts: 178

Thank you, anonimnystefy. I am writing a paper and just wanted to use the correct word, if one existed.

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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

You can just use the word argument, then.

You're welcome.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,772

Hi;

Since this can be thought of as function composition you will sometimes see it called the inside function or first function.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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