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3 天前 · A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.
1 天前 · J. Robert Oppenheimer (born Julius Robert Oppenheimer; / ˈɒpənhaɪmər / OP-ən-hy-mər; April 22, 1904 – February 18, 1967) was an American theoretical physicist. He was director of the Manhattan Project 's Los Alamos Laboratory during World War II and is often called the "father of the atomic bomb ".
2 天前 · 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 of the hypotenuse.
1 天前 · Franklin Delano Roosevelt [a] (January 30, 1882 – April 12, 1945), commonly known by his initials FDR, was an American politician who served as the 32nd president of the United States from 1933 until his death in 1945. He is the only U.S. president to have served more than two terms.
1 天前 · The official chart of the IPA, revised in 2020. The International Phonetic Alphabet ( IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standardized representation of speech sounds in written form. [1] .
21 小時前 · Māori ( Māori: [ˈmaːɔɾi] ⓘ) [i] are the indigenous Polynesian people of mainland New Zealand ( Aotearoa ). Māori originated with settlers from East Polynesia, who arrived in New Zealand in several waves of canoe voyages between roughly 1320 and 1350. [13] .
21 小時前 · Theodore Roosevelt Jr. [b] (October 27, 1858 – January 6, 1919), often referred to as Teddy or by his initials, T. R., was an American politician, soldier, statesman, conservationist, naturalist, and writer who served as the 26th president of the United States from 1901 to 1909.
