快速引用超过150三角方程。
A quick reference to over 150 trigonometric equations that are essential to any student taking a math course with trigonometry as one of its subjects. Complete with zoomable equations as well as a sample problem provided with hint and solution. An easy to use menu with the options All equations, Basics, Identities, Power reduction, Half angle, Triple angle, Calculus. FadiSoft icon on credits page lists all apps by FadiSoft.