It is the best introductory book for elders to revise the subject in a short span of time.They may be required to review the subject for tutoring their wards.
The elders might have forgotten the subject once after entering into a job. Again after 10 or 12 yrs, their children might have come to school final courses, wherein they might have been exposed to the subject Trigonometry & they be in need of assistance from their parents. At this context, parents have to brushup their knowledge in Trigonometry. At this juncture, this book comes handy for parents.
