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# What happened to the 2!? (integrating trig) watch

1. The 2 has disappeared in the integration and I am very sad because I don't know why

I know secxtanx integrated = secx which is why it equals sec^2x but the constant 2 is just gone and I wondered if there was an explanation behind this!

2. (Original post by Crazydavy)
Try differentiating sec^2 x and see what you get. Use the chain rule.
3. (Original post by Crazydavy)
The 2 has disappeared in the integration and I am very sad because I don't know why

I know secxtanx integrated = secx which is why it equals sec^2x but the constant 2 is just gone and I wondered if there was an explanation behind this!

AS
your integral form is

4. Thanks you two!!
5. (Original post by ztibor)
AS
your integral form is

Shouldn't it be

Because using that notation is like: (for example)

6. (Original post by ElMoro)
Shouldn't it be

Because using that notation is like: (for example)

means here
n can be any real (even 1) except 0 and -1
the nth derivative of f

or the second derivative
7. (Original post by ztibor)
means here
n can be any real (even 1) except 0 and -1
the nth derivative of f

or the second derivative
It's usually a better idea to write , or if you don't want to use brackets. It's quite ambiguous notation, but when I see (where ) I interpret it to mean .

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