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  2. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    These identities are useful whenever expressions involving trigonometric functions need to be simplified. 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.

  3. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. The six trigonometric functions are defined for every real number, except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°). Referring to the diagram at the right, the six ...

  4. Pythagorean trigonometric identity - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_trigonometric...

    The Pythagorean trigonometric identity, also called simply the Pythagorean identity, is an identity expressing the Pythagorean theorem in terms of trigonometric functions. Along with the sum-of-angles formulae , it is one of the basic relations between the sine and cosine functions.

  5. Identity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Identity_(mathematics)

    Another important application is the integration of non-trigonometric functions: a common technique which involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity. One of the most prominent examples of trigonometric identities involves the equation ...

  6. De Moivre's formula - Wikipedia

    en.wikipedia.org/wiki/De_Moivre's_formula

    De Moivre's Theorem for Trig Identities by Michael Croucher, Wolfram Demonstrations Project Listen to this article ( 18 minutes ) This audio file was created from a revision of this article dated 5 June 2021 ( 2021-06-05 ) , and does not reflect subsequent edits.

  7. Hyperbolic functions - Wikipedia

    en.wikipedia.org/wiki/Hyperbolic_functions

    In fact, Osborn's rule [18] states that one can convert any trigonometric identity (up to but not including sinhs or implied sinhs of 4th degree) for , , or and into a hyperbolic identity, by expanding it completely in terms of integral powers of sines and cosines, changing sine to sinh and cosine to cosh, and switching the sign of every term ...

  8. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    These trigonometric identities [5] ... A common use of mnemonics is to remember facts and relationships in trigonometry. For example, the sine, cosine, ...

  9. Cofunction - Wikipedia

    en.wikipedia.org/wiki/Cofunction

    These equations are also known as the cofunction identities. [2] [3]This also holds true for the versine (versed sine, ver) and coversine (coversed sine, cvs), the vercosine (versed cosine, vcs) and covercosine (coversed cosine, cvc), the haversine (half-versed sine, hav) and hacoversine (half-coversed sine, hcv), the havercosine (half-versed cosine, hvc) and hacovercosine (half-coversed ...

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