TRIGONOMETRIC IDENTITIES FORMULAS AND EXAMPLES FULL
Several different units of angle measure are widely used, including degrees, radians, and grads: 1 full circle = 360 degrees = 2 π radians = 400 grads. This article uses Greek letters such as alpha ( α), beta ( β), gamma ( γ), and theta ( θ) to represent angles. 15.2 A useful mnemonic for certain values of sines and cosines.13 Relation to the complex exponential function.
12.1 Compositions of trig and inverse trig functions.11 Certain linear fractional transformations.10 Other sums of trigonometric functions.8 Product-to-sum and sum-to-product identities.6.2 Sine, cosine, and tangent of multiple angles.6.1 Double-, triple-, and half-angle formulae.5.4 Secants and cosecants of sums of finitely many terms.5.3 Tangents of sums of finitely many terms.5.2 Sines and cosines of sums of infinitely many terms.An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity. These identities are useful whenever expressions involving trigonometric functions need to be simplified. Only the former are covered in this article. They are distinct from triangle identities, which are identities involving both angles and side lengths of a triangle. Geometrically, these are identities involving certain functions of one or more angles. In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Cosines and sines around the unit circle Trigonometry
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