SUBSCRIBESUBSCRIBESUBSCRIBEHomeHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyGames & QuizzesVideosOn This DayOne Good FactDictionaryNew ArticlesHistory & SocietyLifestyles & Social IssuesPhilosophy & ReligionPolitics, Law & GovernmentWorld HistoryScience & TechHealth & MedicineScienceTechnologyBiographiesBrowse BiographiesAnimals & NatureBirds, Reptiles & Other VertebratesEnvironmentFossils & Geologic TimeInsects & Other InvertebratesMammalsPlantsGeography & TravelGeography & TravelArts & CultureEntertainment & Pop CultureLiteratureSports & RecreationVisual ArtsImage GalleriesPodcastsSummariesTop QuestionsLists and StoriesBritannica KidsAsk the ChatbotGames & QuizzesHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyVideostrigonometric functionIntroduction & Top QuestionsThe ratio methodTrigonometric identitiesReferences & Edit HistoryQuick Facts & Related TopicsImagesNumbers and MathematicsScienceMathematicsFacebookXhttps://www.britannica.com/science/trigonometric-functionOpenStax - Precalculus 2e - Introduction to Trigonometric FunctionsPurdue University Northwest - The Trigonometric FunctionsWhitman College - Trigonometric Functions (PDF)Campus Manitoba PressbooksEDU Network - Calculus: Volume 2 (Second University of Manitoba Edition) - Derivatives of Inverse Trigonometric FunctionsDigital Commons at Ursinus College - A Genetic Context for Understanding the Trigonometric Functions (PDF)Story of Mathematics - Trigonometric Functions � Explanation & ExamplesSimon Fraser University - Trigonometric FunctionsThe Royal Society Publishing - Proceedings A - Basis and regularity properties of (p,q)-trigonometric functions and the decay of (p,q)-Fourier coefficientsDigital Commons at Ursinus College - The Trigonometric Functions Through Their Origins: Varahamihira and the Poetry of Sines (PDF)Mathematics LibreTexts - Trigonometric Functions of Any AngleNewcastle University - Trigonometric Functions (PDF)UTSA Pressbooks - Topics in Precalculus - The Other Trigonometric FunctionsBritannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....HistoryTrigonometric functionssinecosinetangentcotangentsecantcosecantcosinesinesurveyingengineeringnavigationtangentsinecosinecotangentmathematicssinecosinetangentcotangentsecantcosecanttrigonometryvaluescoordinate systemcirclefunctionsurveyingengineeringnavigationtriangleâsacuteintrinsicanalysisderivativesdifferential equationstrigonometryRight triangle diagram with labeled sides and anglescontextadjacentBritannica Quiz
Numbers and MathematicsderivedPythagorean theoremAbÅ« al-WafÄʾtangentcosinesinecosecantcotangentOpenStax - Precalculus 2e - Introduction to Trigonometric FunctionsSee all related contentSUBSCRIBE
From the definitions of the trigonometric functions, one can obtain the following identities. 1 + tan2θ = sec2θ1 + cot2θ = cosec2θ The Editors of Encyclopaedia BritannicaErik Gregersen
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