Is this an error - integration? (1 Viewer)

[MrBrightside]

So I was scrolling through this site and I found this

http://i.imgur.com/YYN8q.gif

is the first one really an error? I've always been brought up to do it on the left column way.

 

[SpiralFlex]

So I was scrolling through this site and I found this

http://i.imgur.com/YYN8q.gif

is the first one really an error? I've always been brought up to do it on the left column way.

The first one is of inverse trignometry. You do that under 3U mathematics.



I think you are thinking of,



Since the integral is in the form of , we can put into natural logarithmic format.

 

[MrBrightside]

The first one is of inverse trignometry. You do that under 3U mathematics.



I think you are thinking of,



Since the integral is in the form of , we can put into natural logarithmic format.

2x on top? its just dx, which when you take it out is just 1 on top

 

[SpiralFlex]

2x on top? its just dx, which when you take it out is just 1 on top

You can only put into natural logarithm format if the top is the derivative of the bottom or affected by a constant.

 

[MrBrightside]

You can only put into natural logarithm format if the top is the derivative of the bottom or affected by a constant.

ah yeah, or you take the 2 outside the integral, correct?

 

[SpiralFlex]

ah yeah, or you take the 2 outside the integral, correct?

Example -

 

[SpiralFlex]

Goodnight Mr Brightside, I hope you ace your trials. Cheerio.

 

[SpiralFlex]

Sorry, I couldn't help it. 2100th post!

 

[woga1]

They wouldn't ask those questions in 2unit. They are 3 unit.

 

[woga1]

except the second question, the rest are 3unit ( I have seen integral of sec(x) in Q10 of a 2unit paper , but that was it ).