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	a delightful cosine identity. (Michael Penn) View
	U7L4 Ex.2A: Using the Difference Identity for Cosine (wolferobynm) View
	A nice complex trigonometric identity. (Michael Penn) View
	A nice inverse trigonometric identity. (Michael Penn) View
	A very nice trigonometric sum. (Michael Penn) View
	A nice trig product (Michael Penn) View
	Simplifying A Nice Trigonometric Expression (SyberMath) View
	Trig identities via Differential Equations (Michael Penn) View
	A Nice Trigonometry Problem (Dr Barker) View
	Why hyperbolic functions are actually really nice (Dr. Trefor Bazett) View