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  2. Law of cosines - Wikipedia

    en.wikipedia.org/wiki/Law_of_cosines

    The law of cosines generalizes the Pythagorean theorem, which holds only for right triangles: if is a right angle then ⁡ =, and the law of cosines reduces to = +. The law of cosines is useful for solving a triangle when all three sides or two sides and their included angle are given.

  3. Spherical law of cosines - Wikipedia

    en.wikipedia.org/wiki/Spherical_law_of_cosines

    If the law of cosines is used to solve for c, the necessity of inverting the cosine magnifies rounding errors when c is small. In this case, the alternative formulation of the law of haversines is preferable. [3] A variation on the law of cosines, the second spherical law of cosines, [4] (also called the cosine rule for angles [1]) states:

  4. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    The spherical cosine formulae were originally proved by elementary geometry and the planar cosine rule (Todhunter, [1] Art.37). He also gives a derivation using simple coordinate geometry and the planar cosine rule (Art.60). The approach outlined here uses simpler vector methods. (These methods are also discussed at Spherical law of cosines.)

  5. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    The law of cosines (also known as the cosine formula or cosine rule) is an extension of the Pythagorean theorem: = + ⁡, or equivalently, ⁡ = +. In this formula the angle at C is opposite to the side c.

  6. Sine and cosine - Wikipedia

    en.wikipedia.org/wiki/Sine_and_cosine

    In mathematics, sine and cosine are trigonometric functions of an angle.The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that ...

  7. History of trigonometry - Wikipedia

    en.wikipedia.org/wiki/History_of_trigonometry

    The law of cosines, in geometric form, can be found as propositions II.12–13 in Euclid's Elements (c. 300 BC), [54] but was not used for the solution of triangles per se. Medieval Islamic mathematicians developed a method for finding the third side of an arbitrary triangle given two sides and the included angle based on the same concept but ...

  8. Pregnant Woman Reportedly Stabbed 14 Times by Pizza Delivery ...

    www.aol.com/pregnant-woman-reportedly-stabbed-14...

    A pregnant woman is recovering in the hospital after she was stabbed multiple times by a pizza delivery driver over the size of her tip, according to reports. The incident happened on Sunday, Dec ...

  9. Trigonometry of a tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Trigonometry_of_a_tetrahedron

    The law of cosines for the tetrahedron [4] relates the areas of each face of the tetrahedron and the dihedral angles about a point. It is given by the following identity: It is given by the following identity:

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