In mathematics, trigonometric identities are equalities that involve trigonometric functions that are true for every single value of the occurring variables (see Identity). Geometrically, these are identities involving certain functions of one or more angles.
http://en.wikipedia.org/wiki/List_of_trigonometric_identities
That was a definition of trigometric identities. That's what we learnt today. Its quite confusing. Im not sure if i fully understand. Its pretty much the weekend. Toodalooo!!!
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