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  2. Inverse trigonometric functions - Wikipedia

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

    The orange sheet in the middle is the principal sheet representing arctan x. The blue sheet above and green sheet below are displaced by 2 π and −2 π respectively. Since the inverse trigonometric functions are analytic functions , they can be extended from the real line to the complex plane.

  3. Bernoulli's principle - Wikipedia

    en.wikipedia.org/wiki/Bernoulli's_principle

    Bernoulli's principle can be derived from the principle of conservation of energy. This states that, in a steady flow, the sum of all forms of energy in a fluid is the same at all points that are free of viscous forces. This requires that the sum of kinetic energy, potential energy and internal energy remains constant.

  4. Principal meridian - Wikipedia

    en.wikipedia.org/wiki/Principal_meridian

    In the United States Public Land Survey System, a principal meridian is the principal north–south line used for survey control in a large region, and which divides townships between east and west. The meridian meets its corresponding baseline at the point of origin, or initial point, for the land survey. For example, the Mount Diablo Meridian ...

  5. Help:Logging in - Wikipedia

    en.wikipedia.org/wiki/Help:Logging_in

    How to log in. First, make sure that your browser accepts cookies. Some browsers can accept or reject cookies from individual sites; users of these should configure the browser to accept cookies from each wiki you plan to edit, such as wikipedia.org . Click on the Log in link at the top-right corner of the page.

  6. Office of the Secretary of Defense - Wikipedia

    en.wikipedia.org/wiki/Office_of_the_Secretary_of...

    The Office of the Secretary of Defense (OSD) is a headquarters-level staff of the United States Department of Defense.It is the principal civilian staff element of the U.S. Secretary of Defense, and it assists the Secretary in carrying out authority, direction and control of the Department of Defense in the exercise of policy development, planning, resource management, fiscal, and program ...

  7. Principal city - Wikipedia

    en.wikipedia.org/wiki/Principal_city

    t. e. In the United States, a principal city is the largest incorporated place with a population of at least 10,000 in a core-based statistical area (CBSA) or New England city and town area (NECTA), or if no incorporated place of least 10,000 population is present in the CBSA or NECTA, the largest incorporated place or census designated place ...

  8. Instagram - Wikipedia

    en.wikipedia.org/wiki/Instagram

    t. e. Instagram [a] is a photo and video sharing social networking service owned by Meta Platforms. It allows users to upload media that can be edited with filters, be organized by hashtags, and be associated with a location via geographical tagging. Posts can be shared publicly or with preapproved followers.

  9. Principal Secretary to the Prime Minister of India - Wikipedia

    en.wikipedia.org/wiki/Principal_Secretary_to_the...

    The Principal Secretary to the Prime Minister of India ( PS to the PM) is the administrative head of the Prime Minister's Office. The officeholder is generally a civil servant, commonly from the Indian Administrative Service and occasionally from the Indian Foreign Service . Since 2019, the officeholder has been accorded with the status of a ...