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2. Trigonometry - Wikipedia

   en.wikipedia.org/wiki/Trigonometry

   Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle' and μέτρον (métron) 'measure') [1] is a branch of mathematics concerned with relationships between angles and side lengths of triangles.

3. List of trigonometric identities - Wikipedia

   en.wikipedia.org/wiki/List_of_trigonometric...

   These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.

4. List of mathematical functions - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_functions

   Thomae's function: is a function that is continuous at all irrational numbers and discontinuous at all rational numbers. It is also a modification of Dirichlet function and sometimes called Riemann function. Kronecker delta function: is a function of two variables, usually integers, which is 1 if they are equal, and 0 otherwise.

5. Trigonometric functions - Wikipedia

   en.wikipedia.org/wiki/Trigonometric_functions

   Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

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7. Ninth grade - Wikipedia

   en.wikipedia.org/wiki/Ninth_grade

   In Denmark, grade 9 (around age 16, also called form level 9) is the final year of compulsory education, and grade 10 is optional. [9] [10] Public comprehensive schools up to grade 10 are called Folkeskole. [10] Grade 9 subjects include Danish, English, Christian studies, history, social studies, mathematics, geography, biology, physics ...

8. Elon Musk calls for 'deleting' the Consumer Financial ... - AOL

   www.aol.com/finance/elon-musk-calls-deleting...

   President-elect Donald Trump listens to Elon Musk as he arrives to watch SpaceX's mega rocket Starship lift off for a test flight from Starbase in Boca Chica, Texas, Tuesday, Nov. 19, 2024.

9. Netanyahu's prostate removal surgery was a success ... - AOL

   www.aol.com/israels-netanyahu-undergo-prostate...

   Israeli Prime Minister Benjamin Netanyahu successfully underwent surgery to have his prostate removed, hospital officials said Sunday.. The 75-year-old leader, who has had a series of health ...