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Baris 165: * [http://www.khanacademy.org/math/trigonometry Khan Academy: Trigonometry, free online micro lectures] * [http://www.pupress.princeton.edu/books/maor/ Trigonometric Delights] {{Webarchive\|url=https://web.archive.org/web/20060414195120/http://www.pupress.princeton.edu/books/maor/ \|date=2006-04-14 }}, by [[Eli Maor]], Princeton University Press, 1998. Ebook version, in PDF format, full text presented. * [http://baqaqi.chi.il.us/buecher/mathematics/trigonometry/index.html Trigonometry] {{Webarchive\|url=https://web.archive.org/web/20071104225720/http://baqaqi.chi.il.us/buecher/mathematics/trigonometry/index.html \|date=2007-11-04 }} by Alfred Monroe Kenyon and Louis Ingold, The Macmillan Company, 1914. In images, full text presented. * [~~http~~https://web.archive.org/web/~~20070625162103~~20060212072618/http://mathdl.maa.org/convergence/1/~~?pa=content&sa=viewDocument&nodeId=212&bodyId=81~~ Benjamin Banneker's Trigonometry Puzzle] at ~~[http://web.archive.org/web/20060212072618/http://mathdl.maa.org/convergence/1/ Convergence]~~ * [http://www.clarku.edu/~djoyce/trig/ Dave's Short Course in Trigonometry] by David Joyce of [[Clark University]] * [http://www.mecmath.net/trig/trigbook.pdf Trigonometry, by Michael Corral, Covers elementary trigonometry, Distributed under GNU Free Documentation License] {{Webarchive\|url=https://web.archive.org/web/20130729114530/http://www.mecmath.net/trig/trigbook.pdf \|date=2013-07-29 }} {{Bidang matematika}}

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