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  2. List of trigonometric identities - Wikipedia

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

    Ptolemy's theorem states that the sum of the products of the lengths of opposite sides is equal to the product of the lengths of the diagonals. When those side-lengths are expressed in terms of the sin and cos values shown in the figure above, this yields the angle sum trigonometric identity for sine: sin(α + β) = sin α cos β + cos α sin β.

  3. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

  4. Comparison of cross-platform instant messaging clients

    en.wikipedia.org/wiki/Comparison_of_cross...

    Examples of such messaging services include: Skype, Facebook Messenger, Google Hangouts (subsequently Google Chat), Telegram, ICQ, Element, Slack, Discord, etc. Users have more options as usernames or email addresses can be used as user identifiers, besides phone numbers. Unlike the phone-based model, user accounts on a multi-device model are ...

  5. Merry Mozzarella Bites Are The Ultimate Easy Holiday App

    www.aol.com/merry-mozzarella-bites-ultimate-easy...

    Yields: 2-4 servings. Prep Time: 10 mins. Total Time: 10 mins. Ingredients. 1/4 c. extra-virgin olive oil. 1 tbsp. thinly sliced chives. 1 tbsp. white balsamic vinegar

  6. List of defunct instant messaging platforms - Wikipedia

    en.wikipedia.org/wiki/List_of_defunct_instant...

    Windows Messenger, 2001–2008; Xfire, 2003–2015; Yahoo! Messenger, 1998–2018 This page was last edited on 26 May 2024, at 11:04 (UTC). Text is available ...

  7. Shoppers hit the Boxing Day 2024 sales at London’s Oxford Street on Thursday, despite reports of footfall being down across all UK destinations in comparison with 2023. Boxing Day footfall was ...

  8. Shane Bieber, currently recovering from Tommy John surgery ...

    www.aol.com/sports/shane-bieber-currently...

    When healthy, Bieber has been among the best pitchers in baseball, with a 3.02 ERA since 2019 that ranks 15th among MLB starters. However, at age 29, there are also signs beyond the injuries that ...

  9. Inverse trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Inverse_trigonometric...

    [1] [10] Another precarious convention used by a small number of authors is to use an uppercase first letter, along with a “ −1 ” superscript: Sin −1 (x), Cos −1 (x), Tan −1 (x), etc. [11] Although it is intended to avoid confusion with the reciprocal, which should be represented by sin −1 (x), cos −1 (x), etc., or, better, by ...