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## Half-Angle Formulas:Formulas 1, 2 and 3 are all fractions of Formulas 4, 5 and 6, these are the same as the squared formulas
except everything is square-rooted and also don't forget the "+"
and "-" signs, which depend on the functions of
and which quadrant is in. For example, if is in second quadrant, then has positive sign
and ,
have negative signs. Here is a way to remember, put one of the
four words in " |
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