The bi-lingual program offers 48630 trigonometric equations with detailed solutions. Considered are all trigonometric functions. Equations vary from simple to extra difficult. Solution methods include substitution, grouping, factoring and more, with a particular emphasis on application of trig formulas. Each step of solution is provided with comprehensive explaining material available in two languages. A student can observe the solution course, study solution methods, learn related concepts, observe proofs of used theorems and formulas and learn mathematical lexicon in a foreign language. Special teacher's options allow developing didactic materials, quizes, tests of varied complexity, lesson plans and generating 20 variant tests on the basis of a constructed example. A large number of tests are already prepared. Viewing and saving solutions in MathML format is available. This program is meant for teachers and students of regular and Montessori schools, for self-education and distant learning. Available is free fully functional version of this program.