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2024年8月27日 · A former world No. 1 in doubles with nine Grand Slam titles, she is regarded as one of the most successful and versatile doubles players in history. She also reached world No. 23 in singles, and is the highest-ranked Taiwanese player in history in both singles and doubles.
3 天前 · Lipnitskaya is the youngest Russian athlete to win a gold medal at the Winter Olympics. Within the women's singles category, she is the youngest gold medalist at the European Championships.
2 天前 · Pythagorean identities. Trigonometric functions and their reciprocals on the unit circle. All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same. For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them.
5 天前 · Modern definitions express trigonometric functions as infinite series or as solutions of differential equations. This allows extending the domain of sine and cosine functions to the whole complex plane, and the domain of the other trigonometric functions to the complex plane with some isolated points removed.
5 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.
5 天前 · Schizophrenia is a mental disorder[17][7] characterized by hallucinations (typically hearing voices), delusions, disorganized thinking and behavior,[10] and flat or inappropriate affect.[7] Symptoms develop gradually and typically begin during young adulthood and are never resolved.[3][10] There is no objective diagnostic test; diagnosis is ...
1 天前 · The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
