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eMath 9 - Trigonometric Functions and Sequences is a mathematics textbook for high school students and teachers. The book follows the Finnish national curriculum (2004) for mathematics education in high school. It can be used as supplementary material for standard mathematics courses in high school. The following topics are covered in the book: trigonometry and trigonometric functions, sequences and summation.

The eMath textbooks can be used by both teachers, as teaching material in math courses, and by students to support their own learning and to provide an alternative view for learning high school mathematics. The eMath textbooks are based on structured derivations - a new method for presenting mathematical argumentation that has proved to improve students learning at high school level.

* A new interactive learning experience
* Based on structured derivations
* Interactive content: graphs, derivations, geometric figures, multiple choice assignments
* Standard assignments with correct answers
* Targeted for both teachers and students
* Contains theory and examples
* Dyslexics font available (OpenDyslexic)
* Alternative layouts

Four Ferries will shortly publish a new virtual learning environment for Mathematics, 4f Studio. It consists of an interactive textbooks, together with a workbook where students can solve mathematics assignments on a computer. Student can submit solutions to course assignments directly to the teacher, and read teachers comments in their own e-books. The teacher can add own material to the textbook material, and publish this directly in students e-books.

More information on Four Ferries products, as well as demo versions, are available on You are also welcome to contact us directly by email,

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