Trigonometry, including: Angle, Euler's Formula, Parallax, Pi, Radian, Trigonometric Functions, Right Angle, Law Of Sines, Trigonometric Tables, List ... Trigonometric Integral, Hypotenuse, Sine Wave

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More info: Trigonometry (from Greek trigōnon "triangle" + metron "measure") is a branch of mathematics that studies triangles and the relationships between their sides and the angles between the sides. Trigonometry defines the trigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such as waves. The field evolved during the third century B.C. as a branch of geometry used extensively for astronomical studies.