For formal engineering, Calculus, Sixth Edition, by Earl Swokowski, Michael Olinick, and Dennis D. Pence is the ultimate book to use. Also, my twin brother used

For formal engineering, Calculus, Sixth Edition, by Earl Swokowski, Michael Olinick, and Dennis D. Pence is the ultimate book to use. Also, my twin brother used it to teach himself Calculus 2. Swokowski wrote phenomenal books, in math, just in general.