Images 8 13 SIN A

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8 13 sin a. Cos п/9 cos 2п/9 cos 4п/9 1/8. 5sin11п/12 cos. Cos 8п/7 cos п/7+sin 8п/7. Sin 36 в п.
Cos п/9 cos 2п/9 cos 4п/9 1/8. 5sin11п/12 cos. Cos 8п/7 cos п/7+sin 8п/7. Sin 36 в п.

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