The Tri chord Theorem and Ptolemy s Theorem are Equivalent to Each Other;
New Proving of the Law of Cosines and the Law of Sines in En
Its range is generally five octaves and three-eighths.
Axiomatic Definition of (Co)sine with Complex Variables;
There are two strings, with a four- or five-octave range.
Design of Controllers and Exponential Stability of a Triangle Loop Strings Network System
a stringed instrument that has triangular body and three strings.
Returns the trigonometric cosine of the given angle (in radians) in the given expression
Sine Rule Is Equivalent for That Vertical Line of a Line Crosses Its Slant Lines;
The calculation principles of "hypotenuse-height method" and "three-point method" are different, but the methods of dealing with the traces are identical.
Returns the trigonometric sine of the given angle (in radians) in an approximate numeric (float) expression
The third tone in a diatonic musical scale, determining the major or minor quality of the tonic chord.
Distinguish tri-port sinusoidal oscillator phasic balance by reactance line
he instrument has two strings with a four-octave range, and it is played with a horsetail-hair bow on the outside of the strings.
One of the pegs securing the strings and regulating their tension on a stringed instrument.
This article refers to: the fixing-string (movable-doh) method and the mode, the feature of the open string of the fixing-string method, the fixing-string method and the range, the fixing-string method and the key, and the special fixing-string method of the erhu.
Kirchhoff Index of Three Special Classes of Chordal Graphs