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Title: Proof without words: tangent plus cotangent is greater or equal than 2
Authors: Plaza, Ángel 
UNESCO Clasification: 1202 Análisis y análisis funcional
Issue Date: 2018
Journal: Mathematics Magazine 
Abstract: Using the representation of tan α and cot α in the unit circle, it is shown without words that tan α + cot α ≥ 2.
ISSN: 0025-570X
DOI: 10.1080/0025570X.2018.1465772
Source: Mathematics Magazine [ISSN 0025-570X], v. 91 (5), p. 363
Appears in Collections:Artículos
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