다음을 증명하라. \[ \cos(56^\circ) \cdot \cos(2\cdot 56^\circ) \cdot \cos(2^2\cdot 56^\circ)\cdot\cdots\cdot \cos(2^{23}\cdot 56^\circ)=\frac{1}{2^{24}}.\]
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다음을 증명하라. \[ \cos(56^\circ) \cdot \cos(2\cdot 56^\circ) \cdot \cos(2^2\cdot 56^\circ)\cdot\cdots\cdot \cos(2^{23}\cdot 56^\circ)=\frac{1}{2^{24}}.\]