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In computing and mathematics, the function atan2 is the 2-argument arctangent. By definition, θ = atan2 ( y , x ) {\displaystyle \theta =\operatorname {atan2} (y,x)} is the angle measure (in radians , with − π < θ ≤ π {\displaystyle -\pi <\theta \leq \pi } ) between the positive x {\displaystyle x} -axis and the ray from the origin ...
[1] [2] All functions use floating-point numbers in one manner or another. Different C standards provide different, albeit backwards-compatible, sets of functions. Most of these functions are also available in the C++ standard library, though in different headers (the C headers are included as well, but only as a deprecated compatibility feature).
Bắc Hà is the capital of the region of the Flower Hmong, one of the 54 minorities of Vietnam and one of the six groups of Hmong people, from 1954 to present.Its name Bắc Hà (Kinh text) was from old name Păkk-hạ in Hmong language, what means "one hundred kunai grass bunches".
Bắc Kạn, sometimes misspelled as Bắc Cạn, is a province of Vietnam.It is located in the Northeast region, due north of the capital Hanoi.. Bắc Kạn is the only town of the province which is the capital of the province and is a municipality.
The modern province of Bắc Giang was founded on 10 October 1895, [7] when it was created out of Bắc Ninh Province. [7] It initially comprised the prefectures of Lạng Giang and Đa Phúc and the districts of Kim Anh, Yên Dũng , Phượng Nhỡn , Việt Yên, Hiệp Hòa, Yên Thế and some small territories south of Lục Nam River.
Tôn Đức Thắng was born to Tôn Văn Đề and Nguyễn Thị Di on Ông Hô Island along the Mekong River, roughly four kilometres from Long Xuyên, the capital of An Giang Province. [2] From 1897 to 1901, Tôn received his education in Nom script , history and Confucian philosophy from a private tutor in Long Xuyên.