This is a set of four books: "Harada's Thorough Introduction to Mathematics 2・B." #Tomoya Harada #Books #Science/Mathematics "Harada's Thorough Introduction to Mathematics 2・B: Complex Numbers and Equations Edition" "Harada's Thorough Introduction to Mathematics 2・B: Trigonometric Functions, Exponential and Logarithmic Functions Edition" "Harada's Thorough Introduction to Mathematics 2・B: University Entrance Exam Mathematics, Sequences, Vectors Edition" "Harada's Thorough Introduction to Mathematics 2・B: Geometry and Equations, Differential and Integral Calculus Edition" There are no writings inside, but as shown in the images, there are scratches, stains, discoloration, folds, dents, fading, and other signs of considerable use. Published in 2008, 2008, 2011, and 2013. I hope to sell these to someone who doesn't mind the condition and can still study with them. Individual sales or price reductions are difficult. If you have any questions or would like to see additional photos, please feel free to comment. m(_ _)m