sin of 60 degrees in radians

"Radians and degrees are two different units of the measurement angle. Just like "meters" and "city ruler" are two different units that measure the length.In flash, the angle in rotation is measured in degrees, and the angle in trigonometric

CREATE DEFINER=`root`@`%` FUNCTION `f_getdistance`(in_from_x decimal(10,3), in_from_y decimal(10,3),in_to_x decimal(10,3),in_to_y decimal(10,3)) RETURNS decimal(20,10)BEGINdeclare line LineString;#select CONCAT('LineString(',in_from_x,' ',in_from_y,'

Java report tool FineReport common functions usage Summary (mathematical and trigonometric functions), javafinereport  ABS ABS (number): returns the absolute value of a specified number. Absolute Value refers to a value without positive or negative

1. Coordinate system:Flash coordinate system and mathematical coordinate system: the X axis is the same, and the y axis is the opposite.[Mathematical coordinate system][Coordinate system in Flash]2. Conversion between Angle and Radian:(1) radians:

In the past two days, I have read the quad-tree code written by my colleagues, and used the conversion between the degree of loneliness and angle. So I reprinted this article and learned it.   01 radian relationship with angle 1. Two angle

How do I determine the conversion of the blog. csdn. netvincent_czzarticledetails7963740 and above? The earth is constantly rotating around the Earth's axis (the Earth's axis is a hypothetical line through the earth's north and south poles and the

How are these cable cables determined? The earth is constantly rotating around the Earth's axis (the Earth's axis is a hypothetical line through the earth's north and south poles and the Earth's Center), draw a large circle perpendicular to the

Calculate distance based on two-point latitude and longitudeHow are these longitude determined? The earth is constantly spinning around its axis (the earth's axis is a center of the north-south poles and the Earth.Imaginary line), in the Earth's

Original link: Calculate distance according to two-point latitude and longitudeHow are these longitude determined? The earth is constantly spinning around its axis (the earth's axis is a center of the north-south poles and the Earth.Imaginary line),

The formula is as follows, unit meters:1th latitude and Longitude: lng1 LAT12nd latitude and Longitude: lng2 lat2Round (6378.138*2*asin (sqrt (POW (LAT1*PI ()/180-lat2*pi ()/180)/2), 2) +cos (Lat1*pi ()/180) *cos (LAT2*PI ()/180) * Pow (Sin