Can't recommend anything right now but to point you in the right direction:
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Taylor expansions...hyperbolic trig functions...l'hopital's rule, sequences and series etc.
These should be covered in any calculus text, although if you're looking for more in depth and you're otherwise comfortable with the calculus you might want to look into an analysis or advanced calc text.
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Euler's Formula ( e^ix = cos(x) +i*sin(x) )
Will be covered in any complex variables text.
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ODEs
Basic (seperable) ODEs will be covered in a calc book, but you'll probably need a book devoted to the subject.
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