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2. Law of tangents - Wikipedia

   en.wikipedia.org/wiki/Law_of_tangents

   In trigonometry, the law of tangents or tangent rule [1] is a statement about the relationship between the tangents of two angles of a triangle and the lengths of the opposing sides. In Figure 1, a , b , and c are the lengths of the three sides of the triangle, and α , β , and γ are the angles opposite those three respective sides.

3. Outline of trigonometry - Wikipedia

   en.wikipedia.org/wiki/Outline_of_trigonometry

   Dave's short trig course; Trigonometric Delights, by Eli Maor, Princeton University Press, 1998. Ebook version, in PDF format, full text presented. Trigonometry by Alfred Monroe Kenyon and Louis Ingold, The Macmillan Company, 1914. In images, full text presented. Trigonometry FAQ

4. Khan Academy - Wikipedia

   en.wikipedia.org/wiki/Khan_Academy

   Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] ...

5. Trigonometry - Wikipedia

   en.wikipedia.org/wiki/Trigonometry

   Trigonometric functions were among the earliest uses for mathematical tables. [48] Such tables were incorporated into mathematics textbooks and students were taught to look up values and how to interpolate between the values listed to get higher accuracy. [49] Slide rules had special scales for trigonometric functions. [50]

6. SAT - Wikipedia

   en.wikipedia.org/wiki/SAT

   Starting with the 2015–16 school year, the College Board began working with Khan Academy to provide free online SAT preparation courses. [10] In the past, the test was taken using paper forms. Starting in March 2023 for international test-takers and March 2024 for those within the U.S., the testing is administered using a computer program ...

7. Mnemonics in trigonometry - Wikipedia

   en.wikipedia.org/wiki/Mnemonics_in_trigonometry

   Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.