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  1. The pound ( sign: £) is the main unit of sterling, [4] and the word pound is also used to refer to the British currency generally, [5] often qualified in international contexts as the British pound or the pound sterling. [4] Sterling is the world's oldest currency in continuous use since its inception. [6] .

  2. en.wikipedia.org › wiki › Pound_signPound sign - Wikipedia

    The pound sign ( £) is the symbol for the pound unit of sterling – the currency of the United Kingdom and its associated Crown Dependencies and British Overseas Territories and previously of Great Britain and of the Kingdom of England. The same symbol is used for other currencies called pound, such as the Egyptian and Syrian pounds.

  3. 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.

  4. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] [2] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

  5. Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has.

  6. A currency pair is the quotation of the relative value of a currency unit against the unit of another currency in the foreign exchange market. The currency that is used as the reference is called the counter currency, quote currency, or currency [1] and the currency that is quoted in relation is called the base currency or transaction currency.

  7. The New Taiwan dollar [I] ( code: TWD; symbol: NT$, also abbreviated as NT) is the official currency of the Republic of China. The New Taiwan dollar has been the currency of the island of Taiwan since 1949, when it replaced the old Taiwan dollar, at a rate of 40,000 old dollars per one new dollar. [1] .