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Tangent half-angle formula
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{{short description|Relates the tangent of half of an angle to trigonometric functions of the entire angle}} {{Trigonometry}}In [[trigonometry]], '''tangent half-angle formulas''' relate the tangent of half of an angle to trigonometric functions of the entire angle.<ref>''[https://books.google.com/books?id=ztcDUEiHLCYC&pg=SA6-PA19 Mathematics]''. United States, NAVEDTRA [i.e. Naval] Education and Training Program Management Support Activity, 1989. 6-19.</ref>
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