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  2. List of trigonometric identities - Wikipedia

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

    In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined.

  3. Shoelace formula - Wikipedia

    en.wikipedia.org/wiki/Shoelace_formula

    Shoelace scheme for determining the area of a polygon with point coordinates (,),..., (,). The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2]

  4. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices.

  5. Calculus of constructions - Wikipedia

    en.wikipedia.org/wiki/Calculus_of_constructions

    The CoC is a higher-order typed lambda calculus, initially developed by Thierry Coquand.It is well known for being at the top of Barendregt's lambda cube.It is possible within CoC to define functions from terms to terms, as well as terms to types, types to types, and types to terms.

  6. Quaternion - Wikipedia

    en.wikipedia.org/wiki/Quaternion

    Quaternions were introduced by Hamilton in 1843. [9] Important precursors to this work included Euler's four-square identity (1748) and Olinde Rodrigues' parameterization of general rotations by four parameters (1840), but neither of these writers treated the four-parameter rotations as an algebra.

  7. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_molecular_geometry

    In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron.The bond angles are arccos(− ⁠ 1 / 3 ⁠) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH 4) [1] [2] as well as its heavier analogues.

  8. Four Immortals - Wikipedia

    en.wikipedia.org/wiki/Four_Immortals

    The Four Immortals (Vietnamese: Tứ bất tử, chữ Hán: 四不死) refers to the four chief figures in the pantheon of genii worshiped by the Vietnamese people of the Red River Delta region in legend and mythology. [1]

  9. List of VTV dramas broadcast in 1997 - Wikipedia

    en.wikipedia.org/wiki/List_of_VTV_dramas...

    These films were released on VTV channel during Tet holiday. In this time, all of the channels were merged with a single broadcast schedule. Note: Since late 1996, Vietnam Television Audio Visual Center (Vietnamese: Trung tâm nghe nhìn - Đài truyền hình Việt Nam) had been converted to Vietnam Television Film Production (Vietnamese: Hãng phim truyền hình Việt Nam).