Trigonometry Examples

$\sin (\frac{x}{9}) \cos (\frac{8 x}{9}) + \cos (\frac{x}{9}) \sin (\frac{8 x}{9})$

Step 1

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$\sin (\frac{x}{9}) \cos (\frac{8 x}{9}) + \cos (\frac{x}{9}) \sin (\frac{8 x}{9})$