Brushing up on Calc

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I am an engineering major. I have taken calc 1-3 and did very well in each course. However, I feel that I did well mostly by learning the tricks and feel that I need a better intuitive understanding of the fundamentals of calculus. I am looking for a book to help me (preferably a cheaper one, not a $100 textbook). I would appreciate some suggestions. Thanks!

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I have referred to Prof. Strang's textbook on Calculus regularly whenever I need a quick refresher. It is heavy on intuition. While there are many books out there on Calculus, the following free ebooks that I stumbled upon recently maintain the right balance between intuition and rigor, in my opinion.

Calculus and Linear Algebra. Vol. 1: Vectors in the Plane and One-Variable Calculus - Wilfred Kaplan and Donald J. Lewis

Calculus and Linear Algebra. Vol. 2: Vector Spaces, Many-Variable Calculus, and Differential Equations - Wilfred Kaplan and Donald J. Lewis