Trigonometry Examples

$\sin (\frac{15}{2} + 2 \cdot 15) = \cos (2 \cdot 15 + \frac{3 \cdot 15}{2})$

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$\sin (\frac{15}{2} + 2 \cdot 15) = \cos (2 \cdot 15 + \frac{3 \cdot 15}{2})$