Laws and Formulas
Half Angle Formulas
Draft for Information Only TrigonometryTrigonometric functions are related with the properties of triangles. Some laws and formulas are also derived to tackle the problems related to triangles, not just rightangled triangles. Half Angle Formulas
With the introduction of the semiperimeter concept, the half angle identities of trigonometric functions can also be expressed in term of the semiperimeter of a triangle or sides of a triangle. The half angle formula for the sine funcion of an internal angle of a triangle can be obtained from the half angle identities of sine function by substituting the result of cosine function formula. Imply
The half angle formula for the cosine funcion of an internal angle of a triangle can be obtained from the half angle identities of cosine function by substituting the result of cosine function formula. Imply
The half angle formula for the tangent funcion of an internal angle of a triangle can be obtained from the half angle identities of tangent function by substituting the result of cosine function formula or from the half angle formula for sine and cosine functions directly. Imply
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ID: 130600025 Last Updated: 2013/6/21 Revision: Ref: 
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