[Index] Introduction Essence Memorizing How to memorize Basic Formulas Sum and Difference Formulas Double & Triple Angle Formulas Half Angle Formulas Product to Sum Formulas Sum to Product Formulas All Formulas Understanding Page 1 Page 2 Page 3 Page 4 Page 5 Summarizing Page 1 Page 2 Examples Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 General ideas Exercises Final thoughts		Page 1 | Proof(s) Proof of example 1:

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