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  2. List of trigonometric identities - Wikipedia

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

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  3. Contact angle - Wikipedia

    en.wikipedia.org/wiki/Contact_angle

    The contact angle (symbol θC) is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the surface tangent on the liquid– vapor interface and the tangent on the solid–liquid interface at their intersection. It quantifies the wettability of a solid surface by a liquid via the ...

  4. Gann angles - Wikipedia

    en.wikipedia.org/wiki/Gann_angles

    Calculating a Gann angle is equivalent to finding the derivative of a particular line on a chart in a simple way. [1] A Gann angle is a straight line on a price chart, giving a fixed relation between time and price. For Gann the most important angle was the line which represented one unit of price for one unit of time, called the 1x1 or the 45 ...

  5. Harmonic series (mathematics) - Wikipedia

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

    Calculus. In mathematics, the harmonic series is the infinite series formed by summing all positive unit fractions : The first terms of the series sum to approximately , where is the natural logarithm and is the Euler–Mascheroni constant. Because the logarithm has arbitrarily large values, the harmonic series does not have a finite limit: it ...

  6. 1,1,1-Trichloro-2,2,2-trifluoroethane - Wikipedia

    en.wikipedia.org/wiki/1,1,1-Trichloro-2,2,2-tri...

    1,1,1-Trichloro-2,2,2-trifluoroethane. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Asymmetrical trichlorotrifluoroethane, also called 1,1,1-Trichloro-2,2,2-trifluoroethane or CFC-113a is a chlorofluorocarbon (CFC). It has the formula CCl3CF3 .

  7. Golden angle - Wikipedia

    en.wikipedia.org/wiki/Golden_angle

    The golden angle is the angle subtended by the smaller (red) arc when two arcs that make up a circle are in the golden ratio. In geometry, the golden angle is the smaller of the two angles created by sectioning the circumference of a circle according to the golden ratio; that is, into two arcs such that the ratio of the length of the smaller arc to the length of the larger arc is the same as ...

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