Trigonometric Formula Sheet De nition of the Trig Functions

Tangent and Cotangent Identities tan = sin cos cot = cos sin Reciprocal Identities sin = 1 csc csc = 1 sin cos = 1 sec sec = 1 cos tan = 1 cot cot = 1 tan ... a2 + b2 Complex Modulus (a+ bi) = a bi Complex Conjugate (a+ bi)(a+ bi) = ja+ bij2 DeMoivre’s Theorem Let z= r(cos + isin ), and let nbe a positive integer.

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