219-220: Double Angle Formulae

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E6-04 Compound Angles: Introducing the Double Angle Formulae

E6-05 Compound Angles: Using Double Angle Formulae to Integrate

E6-06 Compound Angles: Using Double Angle Formulae to Solve Equations

E6-07 Compound Angles: More Equations using Double Angle Formulae

E6-08 Compound Angles: EXTENSION Triple Angle Formulae