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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 387

What is inverse of a function please explain me with graph after this I post questions

Math !!!!.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,844

hi

It is a second function that maps each element in the codomain back to the element in the domain.

eg. If f(x) = 2x then the inverse function is x/2

eg. If g(x) = sin(x) then the inverse is asin(x) or sometimes written arcsin(x)

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 387

How??? Proov

Math !!!!.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,844

It is how an inverse function is defined. Say the function does this:

Domain Range

3 ------------------------> 7

8 ------------------------> 2

9 ------------------------> 0

Then the inverse function will be:

Domain Range

7 ------------------------> 3

2 ------------------------> 8

0 ------------------------> 9

So you just have to look at which number maps onto which and reverse the direction of the mapping.

Please post a question and hopefully it will become clearer.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 387

That not a Proov that only word explaination of inverse

Math !!!!.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,844

Sorry but I do not know what you want to be proved. What question?

Have a look at this page: http://www.mathsisfun.com/data/function-grapher-old.php

Enter a function (say 2x) and a second function, x/2. Try out different pairs such as 5x and x/5; x^2 and sqrt(x); sin(x) and asin(x).

What do you notice?

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Freiza****Member**- Registered: 2017-02-21
- Posts: 6

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