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Viète. 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.
The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...
In the Analects, Confucius presents himself as a "transmitter who invented nothing".He puts the greatest emphasis on the importance of study, and it is the Chinese character for study (學) that opens the text. Far from trying to build a systematic or formalist theory, he wanted his disciples to master and internalize older classics, so that their deep thought and thorough study would allow ...
Charles John Huffam Dickens (/ˈdɪkɪnz/; 7 February 1812 – 9 June 1870) was an English novelist and social critic who created some of the world's best-known fictional characters, and is regarded by many as the greatest novelist of the Victorian era.[1] His works enjoyed unprecedented popularity during his lifetime and, by the 20th century ...
Charles Babbage KH FRS (/ˈbæbɪdʒ/; 26 December 1791 – 18 October 1871) was an English polymath.[1] A mathematician, philosopher, inventor and mechanical engineer, Babbage originated the concept of a digital programmable computer.[2] Babbage is considered by some to be "father of the computer".[2][3][4][5] He is credited with inventing ...
Sir Charles Spencer Chaplin KBE (16 April 1889 – 25 December 1977) was an English comic actor, filmmaker, and composer who rose to fame in the era of silent film. He became a worldwide icon through his screen persona, the Tramp, and is considered one of the film industry's most important figures. His career spanned more than 75 years, from ...
Venus is the second planet from the Sun. It is a terrestrial planet and is the closest in mass and size to its orbital neighbour Earth. Venus is notable for having the densest atmosphere of the terrestrial planets, composed mostly of carbon dioxide with a thick, global sulfuric acid cloud cover. At the surface it has a mean temperature of 737 ...
