Calculus of Variations

How to Solve It: A New Aspect of Mathematical Method

Spaces of Fundamental and Generalized Functions

Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies (Academic Edition)

Mathematics for the Physical Sciences

Trigonometry

An Illustrated Book of Bad Arguments: Learn the Lost Art of Making Sense (Bad Arguments)

The (Mis)Behaviour of Markets: A Fractal View of Risk, Ruin and Reward

Discriminants, Resultants, and Multidimensional Determinants

A Beginner's Guide to Constructing the Universe: The Mathematical Archetypes of Nature, Art, and Science

Functions and Graphs

103 Trigonometry Problems: From the Training of the USA IMO Team

Fast Math: Learn the Secrets of Mental Math: By Using Vedic Math and Other Math Tricks to Perform Mental Calculations from Multiplication to Percentages without Calculators

536 Puzzles and Curious Problems

Foundations and Fundamental Concepts of Mathematics

Logic: A Very Short Introduction: Edition 2

That's Maths: The Mathematical Magic in Everyday Life