why is the first term's answer -sqrt(4-x^2) instead of -2sqrt(4-x^2)

[sick spire]

Can u show your work?

[south verge]

oh wait

i just forgot to multiply

thank you

[sick spire]

no problem happy to help

[south verge]

actually just kidding

[red rune]

!done

[sturdy magnet]

If you are done with this channel, please mark your problem as solved by typing .close

[south verge]

nope i got a compeltely different answer

sorry..

[sick spire]

forgiven and forgotten, show your work

[south verge]

The second part is all good

But my math is messed up on the first terk

[south verge]

I have a feeling something here is wrong

[sick spire]

well dx is missing

[serene girder]

i make this

[lapis gust]

4-x2 would differentiate to give -2x(dx)

But you'd use trigonometric substitution

[lapis gust]

ye

[south verge]

And that -2 is what i got at first

But the website and photomath are saying it ahould just be -

[sick spire]

i would consider a trig sub here, your first sub attempt doesnt seem to work out well

[south verge]

hmm wait let me try arcsin

wait

how

ok for example all these websites are jsut doing this

[sick spire]

You could try the substitution $u = \sqrt{4-x^2}$

[south verge]

But wouldnt that just leave me with -x