This bilingual training program offers 19292 of fully explained step by step solutions of trigonometric equations together with test authoring tools. Problems of 11 levels of complexity vary from basic elementary tasks to advanced trig equations. All trigonometric and arc-trigonometric functions are included. Solution methods include universal substitution, formulas of product and addition of trigonometric functions, power reduction, multiple argument, shift of argument, and more. Each solution step is provided with the corresponding objective, definition, rule and proof of the underlying math formulae or theorem. Tutoring material is available in two languages and is always under hand. Special options help teachers create quizzes, tests, variant tests, exams and homeworks of varied complexity and develop problem solving lesson plans. A number of variant tests are ready for students to review and reinforce their skills. Free fully functional demo version of this program is available

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