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Calculus - Simplifying equation (possible error)

I have a Calculus book with the following equation which is then simplified down but I think that there might be an error.

I have pointed out where I think the error is and what I think the correction should be.

Attachment 26681

Can anyone please confirm this for me. If I am wrong could you please tell me why.

Many thanks in advance.

Re: Calculus - Simplifying equation (possible error)

Quote:

Originally Posted by

**DaveG82** I have a Calculus book with the following equation which is then simplified down but I think that there might be an error.

I have pointed out where I think the error is and what I think the correction should be.

Attachment 26681
Can anyone please confirm this for me. If I am wrong could you please tell me why.

Yes it should be .

Re: Calculus - Simplifying equation (possible error)

Am I correct in assuming that ?

Re: Calculus - Simplifying equation (possible error)