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	The Sum and Difference Identities. Deriving the Cofunction Identities. (Dr D’s Math Help) View
	Lesson 8 3 Sum and Difference, and Cofunction Identities (Fech) View
	Sum and Difference Formulas for Co-functions (e-DEOlogy) View
	Cofunction identities and sum and difference formulas (Hoa Kim (FVHS)) View
	Deriving the Double Angle Identities from the Sum and Difference Identities (mathstuff) View
	Cofunction Identities with Practice Problems and Derivation (Code on the Rocks) View
	Formulas for Trigonometric Functions: Sum/Difference, Double/Half-Angle, Prod-to-Sum/Sum-to-Prod (Professor Dave Explains) View
	Trig Identities: Solving sin sum/difference problems by using cofunction identities. (SuperMathPrincess) View
	Cofunction Identities \| Trigonometry (Derivability) View
	Deriving the Sum Identity for the Sine Function (Richard Swearingen Outdoors) View