Example 26 Prove Cos 2x Cos X 2 Cos 3x Cos 9x 2 Sin 5x

Example 26 Prove Cos 2x Cos X 2 Cos 3x Cos 9x 2 Sin 5x
Example 26 Prove Cos 2x Cos X 2 Cos 3x Cos 9x 2 Sin 5x
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