differentiate the function \[\ y=(3x+4)^{2} \]\ using the chain rule, i got 6(3x+4) but my book says 6(3x+1) ... who is right?

- sasogeek

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- anonymous

You

- TuringTest

yup ;)

- Mertsj

Sue the publisher. You can become rich.

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## More answers

- sasogeek

should i keep using that book? it has many examples i want to solve but this one and it's solution just seemed odd

- Mertsj

Sure as long as you have us to verify your work.

- anonymous

It happens to all books. They sometimes have wrong answers. If they have a lot of incorrect answers you should stop, but otherwise it should be OK.

- anonymous

Every book should come with errata.

- EarthCitizen

typo error mayb

- sasogeek

well this is the 3rd one, the other two, i checked with my friend's answers, we had the same thing but the book was just wrong, but i've solved more than 200 questions from this book with many right answers other than these 3 so far

- TuringTest

a book is only viable if\[\frac{\text{errors}}{\text{pages}}\le 0.127\](excess-typo theorem)

- anonymous

Seems like a very unreliable book to me

- slaaibak

aka less than 1 mistake total in 8 pages :D

- TuringTest

that's generous!

- anonymous

Or one problem out of 8 per page.

- anonymous

Why study from book OCW single variable is the best introductory calculus course that I have seen.

- sasogeek

it's just a book with thousands of problem sets and examples on many topics and my teachers recommend it because of it's many examples...

- EarthCitizen

does OCW have intro complex numbers?

- anonymous

For book I like Thomas calculus, it's the best book that I have seen.

- anonymous

Do you mean complex analysis? @EC

- asnaseer

I would say it's more important for a book to have good explanations of the concepts rather than necessarily have all the answers printed correctly. But I agree, if there are too many mis-printed answers then it can put you off track.

- anonymous

If asnaseer writes a book I will buy it.

- EarthCitizen

yh sound similar

- asnaseer

sasogeek would be the editor and reject all my mis-printed answers :)

- sasogeek

it's concepts are laid out correctly and explanations are just okay though i must say, they only seem to mess up with some answers

- sasogeek

lol asnaseer

- EarthCitizen

yh I guess it's called complex analysis @FFM

- anonymous

haha asnseer and we will ask myin to do the proof-reading

- asnaseer

no - myininaya should be the illustrator :)

- anonymous

@EC:I never searched, sorry.

- sasogeek

hahahahaha so true asnaseer

- anonymous

haha :D

- EarthCitizen

yh no p

- TuringTest

http://ocw.mit.edu/courses/#mathematics
there are a couple of 'complex variables' classes
I assume those are the same thing

- EarthCitizen

nice link @ TT, new stuffs too

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