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2. 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.

3. List of logarithmic identities - Wikipedia

   en.wikipedia.org/wiki/List_of_logarithmic_identities

   5 Inequalities. 6 Tropical identities. ... Download as PDF; Printable version; ... List of trigonometric identities; References

4. List of triangle inequalities - Wikipedia

   en.wikipedia.org/wiki/List_of_triangle_inequalities

   The parameters most commonly appearing in triangle inequalities are: the side lengths a, b, and c;; the semiperimeter s = (a + b + c) / 2 (half the perimeter p);; the angle measures A, B, and C of the angles of the vertices opposite the respective sides a, b, and c (with the vertices denoted with the same symbols as their angle measures);

5. List of limits - Wikipedia

   en.wikipedia.org/wiki/List_of_limits

   1.5 Inequalities. 2 Polynomials and ... 5 Trigonometric functions. 6 Sums. 7 Notable special limits. ... Download as PDF; Printable version; In other projects ...

6. Law (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Law_(mathematics)

   Triangle inequality: If a, b, and c are the lengths of the sides of a triangle then the triangle inequality states that +, with equality only in the degenerate case of a triangle with zero area. In Euclidean geometry and some other geometries, the triangle inequality is a theorem about vectors and vector lengths :

7. List of mathematical identities - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical...

   Lagrange's trigonometric identities; List of logarithmic identities; MacWilliams identity; Matrix determinant lemma; Newton's identity; Parseval's identity; Pfister's sixteen-square identity; Sherman–Morrison formula; Sophie Germain identity; Sun's curious identity; Sylvester's determinant identity; Vandermonde's identity; Woodbury matrix ...