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Trigonometric identities formulas, relations, examples, videos. The trigonometric identities and trigonometric ratios. Integration can be used to find areas, volumes, central points and many useful things. Solutions of all exercise questions, examples are given, with detailed explanation. Then, the collection of all its primitives is called the indefinite integral of f x and is denoted by. These trigonometric formulae are helpful in determining the domain, range, and value of a compound trigonometric function. Cbse class 12 maths formulas pdf free download ncert books. As the name implies, trigonometric identities consist of various formulae which are equalities that involve trigonometric functions and are true for every value of the occurring variable.