**Question**

This question involves formulas related to compound
angles, specifically a product to sum formula and double angle formulas
involving cosines.

**Important Formulas**

**Solution**

**Suitable Levels**

*****GCE ‘O’ Level Additional Mathematics

* revision for GCE ‘A’ Level H2 Mathematics

* revision for IB Mathematics HL / SL

* other syllabuses that teach further trigonometry

* other syllabuses that teach further trigonometry

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