### Possible Answer

Trigonometric Identities; 1a. Trigonometric ... Fundamental Trigonometric Identities. ... related formulas that can be used when proving trigonometric identities. - read more

Proving Trigonometric Identities ... "Provinig Trigonometric Identities." Purplemath. Available from http://www.purplemath.com/modules/proving.htm. ... - read more

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