This is an excellent book for scientists and engineering undergraduates to learn the maths they need. It is *not* a mathematician's book - it has no proofs and theorems - it is a book for people who want to use maths to solve real problems.
It is similar in style to Boas' book and covers very similar ground but in a slightly different way. I slightly prefer Boas, but used both books as an undergraduate because they complemented each other - if I didn't understand something in one book, then I probably understood it in the other.
The most important thing about this book is that it has many worked examples and it has copious exercises *with answers* - this is vitally important when learning maths.