Mathwords: Half Angle Identities

for tangent u/2, it shows two formulas.

how do you know which one to use? or do they equal the same thing

1-cos u / sin u

or

sin u / 1 + cos u

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- Mar 19th 2008, 05:39 PMalgebra2how do you choose which half angle formula (tan) to use?
Mathwords: Half Angle Identities

for tangent u/2, it shows two formulas.

how do you know which one to use? or do they equal the same thing

1-cos u / sin u

or

sin u / 1 + cos u - Mar 19th 2008, 06:07 PMtopsquark