The versine, coversine, haversine, and exsecant were used in navigation. For example, the haversine formula was used to calculate the distance between two points on a sphere. They are rarely used today.
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Multiple-angle formulae Double-angle, triple-angle, and half-angle formulae Double-angle formulae Triple-angle formulae ...
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These are also known as the addition and subtraction theorems or formulae . The identities can be derived by combining right triangles ... -
By examining the unit circle, the following properties of the trigonometric functions can be established. Symmetry When the trigon...
