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  2. Transaction authentication number - Wikipedia

    en.wikipedia.org/wiki/Transaction_authentication...

    A transaction authentication number ( TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication . TANs provide additional security because they act as a form of two-factor ...

  3. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.

  4. Comparison of alphabetic country codes - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_alphabetic...

    Comparison of alphabetic country codes. This is a comparison of the IOC, FIFA, and ISO 3166-1 three-letter codes, combined into one table for easy reference. Highlighted rows indicate those entries in which the three-letter codes differ from column to column. The last column indicates the number of codes present followed by letters to indicate ...

  5. Tax Deduction and Collection Account Number - Wikipedia

    en.wikipedia.org/wiki/Tax_Deduction_and...

    Tax Deduction and Collection Account Number. In India, a Tax Deduction and Collection Account Number ( TAN) is a 10 digit alpha-numeric number issued by the Income Tax Department to the persons who are required to deduct or collect tax on payments made by them under the Indian Income Tax Act, 1961. [1]

  6. Tan Son Nhat International Airport - Wikipedia

    en.wikipedia.org/wiki/Tan_Son_Nhat_International...

    Aerial view of Tan Son Nhut Air Base in 1962. Tan Son Nhat International Airport has its origins in the early 1930s when the French colonial government constructed a small airport with unpaved runways, known as Tân Sơn Nhứt Airfield near the village of Tan Son Nhut. By mid-1956, with U.S. aid, a 7,200-foot (2,190 m) runway had been built ...

  7. Mnemonics in trigonometry - Wikipedia

    en.wikipedia.org/wiki/Mnemonics_in_trigonometry

    An alternate way to remember the letters for Sin, Cos, and Tan is to memorize the syllables Oh, Ah, Oh-Ah (i.e. / oʊ ə ˈ oʊ. ə /) for O/H, A/H, O/A. Longer mnemonics for these letters include "Oscar Has A Hold On Angie" and "Oscar Had A Heap of Apples." All Students Take Calculus Signs of trigonometric functions in each quadrant.

  8. List of trigonometric identities - Wikipedia

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

    de Moivre. Euler. Fourier. v. t. e. 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. Geometrically, these are identities involving certain functions of one or more angles.

  9. Cubic equation - Wikipedia

    en.wikipedia.org/wiki/Cubic_equation

    Cubic equation. Graph of a cubic function with 3 real roots (where the curve crosses the horizontal axis at y = 0 ). The case shown has two critical points. Here the function is and therefore the three real roots are 2, -1 and -4. In algebra, a cubic equation in one variable is an equation of the form. in which a is not zero.