identities - Trigonometric Identities Basic Identities...

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Trigonometric Identities Basic Identities Reciprocal Identities csc θ = 1 sin θ sec θ = 1 cos θ cot θ = 1 tan θ Common Equivalent Forms sin θ = 1 csc θ cos θ = 1 sec θ tan θ = 1 cot θ Ratio Identities tan θ = sin θ cos θ cot θ = cos θ sin θ Pythagorean Identities cos 2 θ + sin 2 θ = 1 1 + tan 2 θ = sec 2 θ 1 + cot 2 θ = csc 2 θ Common Equivalent Forms sin 2 θ = 1 - cos 2 θ sin θ = ± 1 - cos 2 θ cos 2 θ = 1 - sin 2 θ cos θ = ± 1 - sin 2 θ Even-Odd Functions sin( - θ ) = - sin θ cos( - θ ) = cos θ tan( - θ ) = - tan θ Sum and Diference Formulas sin( A + B ) = sin A cos B + cos A sin B sin( A - B ) = sin A cos B - cos A sin B cos( A + B ) = cos A cos B - sin
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identities - Trigonometric Identities Basic Identities...

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