Trigonometry

a proposed reformulation of metrical planar and solid geometries (which includes trigonometry) by Canadian mathematician Norman J.

a measurement of plane angle, defined by representing a full rotation as 360 degrees.

a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function.

(Not to be confused with spirographs, which are generally enclosed by a circular boundary, whereas Lissajous curves are enclosed by rectangular boundaries.) In mathematics, a Lissajous curve /ˈlɪsəʒuː/, also known as Lissajous figure or Bowditch curve /ˈbaʊdɪtʃ/, is the graph of a system of parametric equations which describe complex harmonic motion.

equalities that involve trigonometric functions and are true for every single value of the occurring variables where both sides of the equality are defined.

an angle that bisects the angle formed by two adjacent parts of a straight line.

are functions of an angle.

a mathematical curve that describes a smooth repetitive oscillation.

Early study of triangles can be traced to the 2nd millennium BC, in Egyptian mathematics (Rhind Mathematical Papyrus) and Babylonian mathematics.

a trigonometric identity discovered by Charles Hermite.

Resection is a method for determining an unknown position (position finding) measuring angles with respect to known positions.

The trigonometric functions (especially sine and cosine) for real or complex square matrices occur in solutions of second-order systems of differential equations.

a triangle whose height is much greater than its base.

used to show relations between trigonometric functions.

a teaching and educational research model for spherical geometry.