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en.wikipedia.org/wiki/List_of_trigonometric_identities

In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables where both sides  ...

www.sosmath.com/trig/Trig5/trig5/trig5.html

Reciprocal identities. displaymath161. Pythagorean Identities. displaymath162. Quotient Identities. displaymath163. Co-Function Identities. displaymath164.

www.purplemath.com/modules/idents.htm

Lists the basic trigonometric identities, and specifies the set of trig identities to keep track of, as being the most useful ones for calculus.

www.mathsisfun.com/algebra/trigonometric-identities.html

The Trigonometric Identities are equations that are true for Right Angled Triangles. (If it is not a Right Angled Triangle go to the Triangle Identities page.).

www2.clarku.edu/~djoyce/trig/identities.html

You have seen quite a few trigonometric identities in the past few pages. It is convenient to have a summary of them for reference. These identities mostly refer to ...

Rewrite trigonometric expressions using the Pythagorean identity and other trigonometric identities.