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The sign of trigonometric functions depends on quadrant of the angle. If − π < θ ≤ π {\displaystyle {-\pi }<\theta \leq \pi } and sgn is the sign function ,
The Quadrantids (QUA) are a meteor shower that peaks in early January and whose radiant lies in the constellation Boötes.The zenithal hourly rate (ZHR) of this shower can be as high as that of two other reliably rich meteor showers, the Perseids in August and the Geminids in December, [4] yet Quadrantid meteors are not seen as often as those of the two other showers because the time frame of ...
Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.
A large frame quadrant at the Beijing Ancient Observatory.It was constructed in 1673. A quadrant is an instrument used to measure angles up to 90°.Different versions of this instrument could be used to calculate various readings, such as longitude, latitude, and time of day.
Similarly, a given mass M of gas with changing volume will have variable density δ = M / V, and the ideal gas law may be written P = k T δ so that an isobaric process traces a hyperbola in the quadrant of absolute temperature and gas density. For hyperbolic coordinates in the theory of relativity see the History section.
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It is found to connect the Bajor-B'Hava'el system in the Alpha Quadrant to the Idran system in the Gamma Quadrant, [3] which are seventy thousand light-years apart. Due to the strategic importance of such a phenomenon, the Deep Space Nine space station is moved out of Bajor 's orbit and repositioned 15 kilometres (9.3 mi) from the wormhole ...
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