It is the study of triangles and their properties.
The word 'trigonometry' means three measurements.
The answer depends on what x is meant to represent. Without that information, the question is a waste of time.
plane trigonometry spherical trigonometry
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
Plane trigonometry is trigonometry carried out in (on) a plane. This could be contrasted with spherical trigonometry, which is trigonometry carried out on the surface of a sphere. Certainly there are some other more complex forms of trig.
Trigonometry is applied in construction and building, as trigonometry measures right angled triangles.
Hipparchus is the father of trigonometry.
TRIGONOMETRY
It is a number - in trigonometry or elsewhere.
Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.
trigonometry is very imr
Trigonometry is not important ever
Hipparchus of Nicaea