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Below is the Trigonometry Formulas List that covers basic identities, reciprocal, ratio formulas , sum/difference, and more, essential for exams and quick reference. Check all basic and advanced trigonometry formulas based on trigonometric ratios (sin, cos, tan) and identities. Similarly, inverse of all the trigonometry function is angle. Note : Here angle is measured in radians, not degrees. Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo. Trigonometric identities are equations involving trigonometric functions that hold true for all values of the variables within their domains. There are many such identities, either involving the sides of a right-angled triangle, its angle, or both.
