When was trigonometry first thought to be used?
singleAnswer
2nd millennium BC
History of trigonometry
When was trigonometry first thought to be used
History of trigonometry Trigonometry Hipparchus Indian mathematics Trigonometric functions Triangulation station Unit circle Chord (geometry) List of trigonometric identities Differentiation of trigonometric functions
Early study of triangles can be traced to the 2nd millennium BC, in Egyptian 
mathematics ... The <b>first trigonometric</b> table was apparently compiled by 
Hipparchus of ... They <b>used</b> the words jya for sine, kojya for cosine, utkrama-jya 
for versine, and ... of a sphere, which is <b>considered</b> &quot;the <b>first</b> treatise on spherical 
<b>trigonometry</b>&quot;. <b>Trigonometry</b> is a branch of mathematics that studies relationships between side 
lengths and ... Ptolemy <b>used</b> chord length to define his <b>trigonometric</b> functions, a 
minor difference from the sine convention we use today. ... The modern sine 
convention is <b>first</b> attested in the Surya Siddhanta, and its properties were further
&nbsp;... Hipparchus of Nicaea was a Greek astronomer, geographer, and mathematician. 
He is <b>considered</b> the founder of <b>trigonometry</b> but is most famous for his ... The <b>first</b> 
<b>trigonometric</b> table was apparently compiled by Hipparchus, who is ... 
Hipparchus <b>initially used</b> (Almagest 6.9) his 141 BC eclipse with a Babylonian 
eclipse of&nbsp;... Indian mathematics emerged in the Indian subcontinent from 1200 BC until the 
end of the 18th ... They <b>used</b> a standardised system of weights based on the 
ratios: 1/20, 1/10, 1/5, 1/2, 1, 2, 5, 10, 20, 50, 100, 200, and 500, with the unit 
weight ... This ancient text uses the following as <b>trigonometric</b> functions for the 
<b>first</b> time:. In mathematics, the <b>trigonometric</b> functions are real functions which relate an 
angle of a right-angled triangle to ratios of two side lengths. They are widely <b>used</b> 
in all sciences that are related to geometry, such as ... This formula is commonly 
<b>considered</b> for real values of x, but it remains true for all complex values. Proof: 
Let f&nbsp;... A triangulation station, also known as a triangulation pillar, trigonometrical station
, trigonometrical point, <b>trig</b> station, <b>trig</b> beacon, or <b>trig</b> point, and sometimes 
informally as a <b>trig</b>, is a fixed surveying station, <b>used</b> ... The Ordnance Survey&#39;s 
<b>first trig</b> point was erected on 18 April 1936 near Cold Ashby, Northamptonshire. In mathematics, a unit circle is a circle with unit radius. Frequently, especially in 
<b>trigonometry</b>, ... The unit circle can be <b>considered</b> as the unit complex numbers, 
i.e., the set of complex numbers z of the form ... Triangles constructed on the unit 
circle can also be <b>used</b> to illustrate the periodicity of the <b>trigonometric</b> functions. 
<b>First</b>&nbsp;... A chord of a circle is a straight line segment whose endpoints both lie on the 
circle. A secant ... Chords were <b>used</b> extensively in the early development of 
<b>trigonometry</b>. The <b>first</b> known <b>trigonometric</b> table, compiled by Hipparchus, 
tabulated the value of the chord function for every 7.5 degrees. In the second 
century AD,&nbsp;... In mathematics, <b>trigonometric</b> identities are equalities that involve <b>trigonometric</b> 
functions and ... Several different units of angle measure are widely <b>used</b>, 
including degree, radian, and gradian (gons): ... In each of these two equations, 
the <b>first</b> parenthesized term is a binomial coefficient, and the final <b>trigonometric</b> 
function&nbsp;... The differentiation of <b>trigonometric</b> functions is the mathematical process of 
finding the ... <b>trigonometric</b> functions can be found from those of sin(x) and cos(x) 
by means of the quotient rule <b>applied</b> to functions such as tan(x) = sin(x)/cos(x). ... 
The <b>first</b> and the second are <b>trigonometric</b> identities, and the third is proven 
above.
2nd millennium BC
History of trigonometry